Panaca, Nevada
Cathedral Gorge
Narrow slot canyons in a badland eroded into soft sedimentary rock provide an otherworldly landscape in this remote Nevada state park.
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Panaca, Nevada
Narrow slot canyons in a badland eroded into soft sedimentary rock provide an otherworldly landscape in this remote Nevada state park.
Tonopah, Nevada
An errant donkey ushered in a new era of mining in Nevada.
Quthing, Lesotho
This odd little home was built right into an African rock face.
Lesotho
An 18th-century hideout became a permanent and ongoing residence for one Lesotho tribe.
Tarragona, Spain
Long tunnels run under the ancient chariot racing circuit to the tower.
Šibenik, Croatia
This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.
St Mary, Jersey
This natural crater along the coast of Jersey may take its name from the devil statues who have watched over it.
Tangier, Morocco
Along the most northwestern point in Africa is an ancient cave surrounded by legends.
Leggiuno, Italy
This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.
Stoholm, Denmark
Nearly 40 miles and 1,000 years of limestone mines under Denmark.
Denizli, Turkey
Roman ruins top white travertine terraces formed by ancient hot springs.
Orost, Iran
Iran's colorful terraces are a rare geological masterpiece.
London, England
This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.
Orvieto, Italy
Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.
Parma, Italy
A completely underground tour following the path of the most precious element: water.
Saint-Léonard, Switzerland
The largest underground lake in Europe.
Fethiye, Turkey
These tombs were built into the side of a mountain so that ancient angels could reach the dead.
Diani Beach, Kenya
Drink and dine in a coral cave that's at least 120,000 years old.
Manatí, Puerto Rico
The short hike is worth the stunning views and crystal blue waters of a secluded beach.
Pak Ou, Laos
Thousands of effigies of Buddha watch from caves set high above a legendary river, plus whiskey.
Tremosine, Italy
This winding road through an Italian canyon may be the most scenic drive in the world.
Petrovaradin, Serbia
A maze of underground tunnels beneath one of the most beautiful forts in Serbia.
Eureka Springs, Arkansas
The largest spring in Northwest Arkansas is also home to a sprawling botanical gardens and a historically significant bluff.
Eureka Springs, Arkansas
This restaurant serves wood-fired fare served in a natural cave with a live spring.