The first declared National Monument in the United States.

The rocks in this arid basin leave trails of movement behind them.

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

Started as a kitchen garden, now the second largest botanical garden in the world.

Continuing the tradition of the dime museum in style.

Enormous lake at the bottom of a unique cave system.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

America's most famous piece of self-built architecture.

A 16th-century horror show built in a lovely Italian garden.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

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

Medicinal spa created with the discharge from a geothermal energy plant.

Abandoned railway line circling the city of Paris.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A church of bones, decorated with 40,000 human skeletons.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

An eerie, derelict amusement park in Berlin.

On Japan's Tashirojima Island, cats are king.