The longest navigable underground river in the United States is home to countless blind and albino animals.

The world's longest known cave system.

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

The notorious Wild West outlaw was raised in this unassuming abode.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

A house carved into a rock in the 1940s.

Rippling sand dunes frozen in the Arizona rock.

A magical place that lets you play in and explore the world of Studio Ghibli.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

Secret US military film studio in the Hollywood Hills.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

This grand mansion has starred in everything from Bones to Buffy.

The pit stop from "The Texas Chainsaw Massacre" now serves beef and pork barbecue, not people.

The final resting place of an outlaw, whose legend grew after death.

Towering at a height of over 30 meters, this turn-of-the-18th-century landmark is the tallest temple in Nepal.

A prison-like structure guards the remains of a notorious Old West outlaw.

A wedding chapel, vintage clothing shop, and bar all under one roof.

One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

A hidden bar inside an ad agency has a deliberately misleading name, so employees can stay late under pretext of paperwork.

A wealth of pop culture statuary and green chile dishes give this roadside restaurant clout.

An Old West film set seen in countless TV shows and movies is open for the public to explore.

A quiet nook at the top of a little-known hilltop park named after California's first poet laureate.

This historic aviation building is now a museum owned and operated by Disney.

The ruins of the movie ranch owned by actor and stuntman Ray "Crash" Corrigan.