Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Hollowed out cedar log tubs set in an ancient towering forest.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The United States Capitol's former columns still stand.

A psychedelic labyrinth on the San Francisco bay.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

A layered tribute to the work of mosaicist Isaiah Zagar.

The only theatre in the world constructed specifically for sound movement.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

Enormous lake at the bottom of a unique cave system.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

Most-visited and most-photographed slot canyon in the American Southwest.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

A crumbling hospital from the 1850s on Roosevelt Island.

Rippling sand dunes frozen in the Arizona rock.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

An emerald-green grotto just a short trip from Austin.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

A Romanesque tower appears when water levels drop.

Cliffside houses provide a spectacular view from their perch above the valley.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.