A reproduction of earth's many biomes.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

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

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

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

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

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

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

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

World's first "penitentiary," meant to be humane, drove men insane.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

World's largest collection of serial killer artwork and other macabre exhibits.

An exquisite tunnel of cascading flowers.

Rippling sand dunes frozen in the Arizona rock.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.