This bone-filled cave got its name after they found 140 bear skeletons inside.

Moss and stone turn this waterfall into an otherworldly liquid veil.

The Uyghur settlement in the middle of a lake continues to raise questions.

Site of the largest impact event to occur over land in Earth's recorded history.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

This Scottish burial tomb once held hundreds of ancient eagle bones.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Every autumn, this hillside is ablaze with red summer cypress.

A rare view of a preserved Victorian science museum.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Monasteries on rock pillars, once accessible only by frayed ropes.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Northern Ireland's Brobdingnagian stepping stones.

Staves, storm-calling, and of course, necropants.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Try not to get slimed in Tribeca.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

Tucked in the back of this amazing antique store is an important piece of medical history.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.