Some places are beautiful precisely because they make your stomach drop. This gallery gathers seventeen of them: bottomless-looking springs and sinkholes, sea caves you reach by swimming, ledges thousands of feet above a valley, lakes you enter through a hole in the ice, an active volcano's rim, and waters shared with whale sharks, sardine shoals and saltwater crocodiles. The places span Texas, Mexico, Belize, Indonesia, the Philippines, Croatia, Switzerland, Iceland, Canada, Ecuador, Australia and several US national parks.
Most of the photographs were taken by travellers and adventure photographers who shared them on Instagram, and each is credited below. For every place you will find what it is, where it is, why it looks the way it does, and what a visit actually involves. A few of the original captions exaggerated or got details wrong, so the facts here have been checked against park services, scientific sources and specialist reporting.
Facing a fear in a controlled way can be deeply rewarding; author Tim Ferriss built a popular TED talk around that idea. But "brave" should never mean careless. Several of these sites have claimed lives, and the closing section covers the precautions that matter most.
Springs, sinkholes and layered water
Jacob's Well, Texas
(The Instagram post originally embedded here is no longer available.)
Jacob's Well is an artesian spring near Wimberley in Hays County, central Texas. From the surface, the opening looks like a clear pool, but it leads into a cave system that reaches about 140 feet at its deepest point, with mapped tunnels extending more than 4,000 feet. At least eight or nine divers have died inside, which is why it is often called one of the most dangerous dive sites in the world. Scuba diving now requires a permit from Hays County, so most visitors swim or jump into the open well only. The photo that originally appeared here was shared by Kayla Bloomquist (@always_be_blooming), who also took the preview image at the top.
Labuan Cermin, Indonesia
Travis Burke (@travisburkephotography) on
Travis Burke's photograph shows Labuan Cermin, the "mirror lake" at Biduk-Biduk in Berau, East Kalimantan, on the Indonesian side of Borneo. The lake is famous for its two layers: fresh water sits on top of denser salt water, and the two barely mix, a pattern scientists call meromictic. Swimmers can feel the temperature change at the boundary, where the light turns shimmery and hazy. Reaching it takes a flight to Berau followed by several hours by road.
Cenote Ik Kil, Mexico
Quin (@everchanginghorizon) on
Ik Kil is a cenote, a natural sinkhole in the limestone of the Yucatán Peninsula, close to Chichén Itzá near the village of Pisté. Its water lies about 26 m (85 ft) below ground level, and the pool is roughly 60 m (200 ft) across and about 48 m (157 ft) deep. The Maya regarded it as sacred and, according to accounts of the site, made sacrifices there to the rain god Chaac; bones and jewellery have been recovered from the water. Today it is open for swimming via a carved stairway and has hosted Red Bull Cliff Diving events. Photo: Quin (@everchanginghorizon).
The Great Blue Hole, Belize
This aerial image from the US Geological Survey shows the Great Blue Hole near the centre of Lighthouse Reef, about 70 km (43 miles) off the Belize coast. It is about 318 m (1,043 ft) across and around 124 m (407 ft) deep. It began as a cave system formed when sea levels were much lower during ice ages; the roof collapsed and the rising sea later flooded the sinkhole. Jacques Cousteau ranked it among the world's top ten dive sites, and it is part of the Belize Barrier Reef Reserve System, a UNESCO World Heritage Site.
Swimming with wildlife
Whale sharks near Derawan, Indonesia
Travis Burke (@travisburkephotography) on
Travis Burke photographed this encounter in the Derawan area of East Kalimantan, the same region as Labuan Cermin. Whale sharks are the largest fish in the sea, commonly 18 to 33 feet long and sometimes far larger, about the size of a bus. They are filter feeders that swim with their mouths open to strain plankton and small fish, and they are docile toward people. The species is listed as endangered, so responsible operators keep swimmers at a respectful distance and ban touching.
The sardine shoal at Moalboal, Philippines
KATE & OLLY | TRAVEL COUPLE (@kotravellers) on
Off Panagsama Beach in Moalboal, on Cebu island, a reef wall drops away less than 100 feet from shore, and millions of sardines gather along it. Unlike seasonal fish migrations, the shoal is present nearly all year, and divers and snorkellers can reach it straight from the beach. People sometimes call it a "sardine run", but it is a resident shoal rather than the famous migration of the same name off South Africa. Photo: Kate and Olly (@kotravellers); there is a good first-hand account from Bold Travel.
The "Cage of Death", Darwin, Australia
Todd Eldridge (@toddyeldridge) on
Todd Eldridge's photo was taken at Crocosaurus Cove, a reptile park on Mitchell Street in central Darwin. Its best-known attraction lowers visitors in a clear acrylic cage into a pool with some of the largest saltwater crocodiles in Australia. Saltwater crocodiles are the largest living reptiles, and big males can be several times the size of a person. The cage keeps the experience safe, and it books out quickly, so reservations are recommended.
Caves by sea and underground
A sea cave on a single breath, Hawaii
Travis Burke (@travisburkephotography) on
This freediving shot by Travis Burke was taken in an underwater cave in Hawaii, where volcanic coastlines are riddled with lava tubes and wave-cut caves. In his caption he describes the mix of fear and exhilaration of being inside one on a single breath, especially as swell builds and pushes divers around. Freediving in caves is for trained divers only: never dive alone, and learn about shallow-water blackout before holding your breath underwater.
The blue sea cave near Pula, Croatia
Eric Rubens (@erubes1) on
Eric Rubens captured this sea cave on the coast outside Pula, at the southern tip of Croatia's Istrian peninsula, sometimes nicknamed "Pigeon's Cave". It became an Instagram favourite for the glowing blue light that fills it in the afternoon. According to a detailed guide from Creative Roam, you reach it by a coastal footpath and over the rocks, then swim or jump in; part of the nearby peninsula is a restricted military zone, so stick to the public path.
Carlsbad Caverns, New Mexico
The switchback trail in this photo by MattCloudy is the Natural Entrance route into Carlsbad Caverns National Park. It descends steeply for about 1.25 miles, the equivalent of some 79 storeys, to the Big Room. Unlike most limestone caves, Carlsbad was carved mainly by sulfuric acid, formed when hydrogen sulfide from oil and gas deposits met oxygen-rich water. The limestone itself began as a reef about 265 million years ago. The park advises visitors with heart or breathing problems to take the elevator instead.
Heights and edges
Overhanging Rock, Yosemite
Travis Burke (@travisburkephotography) on
Glacier Point in Yosemite National Park sits about 3,200 feet above the floor of Yosemite Valley, with direct views of Half Dome. Overhanging Rock, a slab jutting over that drop, became famous in vintage photos of visitors posing, even dancing, on its edge. Today's viewpoint has railings, and the sunrise view from behind them, as in Travis Burke's photo, is spectacular on its own. Stepping beyond barriers at a sheer drop is how many park accidents begin.
Sedona, Arizona
Shalee Blackmer (@shaleewanders) on
Shalee Blackmer's aerial view shows the red rock country around Sedona, where buttes and spires of iron-stained sandstone rise from the desert. Cathedral Rock and Bell Rock are the best known, each with popular hiking routes. The climb up Cathedral Rock is short but steep, with sections of scrambling where a slip can be serious, so wear good shoes and avoid it in rain or midday summer heat.
A swing above Quito, Ecuador
(The Instagram post originally embedded here is no longer available.)
Ruby (@rubixcube_) on
Ruby's photograph shows a swing tagged at the Pichincha volcano, which towers over Ecuador's capital, Quito. Swings set on mountain viewpoints have become a signature of Ecuador's highlands, and most are sturdy, purpose-built frames, though it is still wise to hold on tight and use any harness provided. The altitude is the bigger challenge: the slopes above Quito reach close to 4,000 m, so take it slowly on arrival. The first photo here, by Isa (@_bella4u._), is no longer available.
Ice, fire and stillness
Lac Lioson, Switzerland
Antoine Janssens (@antoinejans) on
Antoine Janssens took this winter photo at Lac Lioson, a small mountain lake at about 1,848 m (6,063 ft) above Les Mosses in the canton of Vaud. In summer it is a hiking and fishing spot; in winter it freezes and is used for under-ice diving. Cold-water swimming through a hole in the ice should only be done with experienced organisers, safety lines and someone watching from the surface.
Skaftafell, Iceland
Antoine Janssens (@antoinejans) on
Also by Antoine Janssens, this shot comes from Skaftafell, part of Vatnajökull National Park in southeast Iceland, where outlet glaciers spill down from Europe's largest ice cap. The cracks and ridges are crevasses and pressure waves in moving ice. Glacier walks and ice caves here change every season and can collapse, so visits should always be made with a certified glacier guide and proper equipment.
Mount Bromo, Indonesia
J E N N Y (@awaywithjenny) on
Jenny (@awaywithjenny) photographed the crater rim of Mount Bromo in East Java, an active volcano roughly 2,330 m (about 7,640 ft) high. It rises from the "Sea of Sand", a wide caldera plain, and is sacred to the Tenggerese people, who throw offerings into the crater during the Yadnya Kasada festival. Most visitors watch sunrise from a nearby viewpoint, then climb steps to the rim, often coming back dusted with ash. Bromo erupts from time to time, so check current alerts before going.
A quiet lake in Alberta, Canada
✨ Christy Woodrow ✨ (@ordinarytraveler) on
Not every brave trip involves danger. Christy Woodrow's photo from the Canadian province of Alberta captures the stillness of a Rocky Mountain lake, where fine "rock flour" ground by glaciers gives the water its intense blue-green colour. For many people, travelling alone into that kind of silence takes as much nerve as any cliff.
Before you go: being brave without being reckless
- Check official sources first. Access, permits and conditions change. Park services and local authorities publish closures, eruption alerts and diving rules.
- Use qualified guides for cave diving, glaciers, ice diving and wildlife encounters.
- Know your limits in water. Most deaths at sites like Jacob's Well and the Great Blue Hole involve divers going deeper or further than their training allows.
- Respect wildlife and sacred places. Keep your distance from animals and follow local customs at sites such as Ik Kil and Bromo.
- Stay behind barriers. A photo is never worth a fall.
Treat these photographs as an invitation to research rather than an itinerary. Each place rewards curiosity, and the best adventures are the ones you come home from with a story to tell.
Sources: Photos by Kayla Bloomquist, Travis Burke, Quin, Eric Rubens, Kate and Olly, Shalee Blackmer, Antoine Janssens, MattCloudy (Reddit), Christy Woodrow, Jenny (@awaywithjenny), USGS / Wikimedia Commons, Isa, Ruby and Todd Eldridge, as credited above; gallery idea via Bright Side; Texas Standard: Plumbing the depths of Jacob's Well; Take Your Backpack: Labuan Cermin Lake; Ik Kil (Wikipedia); Surfer Today: The Great Blue Hole of Belize; National Geographic: Whale shark; Scuba Diving: A million sardines in Moalboal; National Park Service: Carlsbad Caverns FAQ; Lac Lioson (Wikipedia); Amusing Planet: Mount Bromo.
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