The labyrinthine storm tunnels beneath the city of Melbourne are ruled by a band of urban explorers.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

The only boathouse Frank Lloyd Wright ever designed was also the only unbuilt structure in his famous Wasmuth Portfolio, until 2007.

The seat of Buffalo government is a gorgeous Art Deco palace.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

This former sugarcane transport tunnel is now a portal to a lovely beach.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

There is a small island in the Gulf of Nicoya where the only human inhabitants are dead.

This crumbling Art Deco movie palace in Mexico City has been abandoned for two decades.

A quirky and charming restaurant founded by artists.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

This granite monument at the site of an ill-conceived tourist attraction is built from the same stone as the Mormon Temple.

Pyramid home to an obscure religious group that practices modern mummification.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

Inside this clubhouse is a cinephile's paradise.

A fashion designer's dazzling world of Japanese collectibles is hidden in a warehouse downtown.

An expansive book store, art gallery, and curio shop with wares ranging from tarot cards to novelty socks.

The Hollywood home of Kermit the Frog and Yoda used to be Charlie Chaplin's film studio.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

A classic American barn that was the home of a classic American television star.

"Prepare yourself! You are to become the voice of Interplanetary Parliament."

Pizza joint known for labor-inducing salad dressing.

A three-story, three-dimensional hobo clown in a tutu welcomes CVS shoppers.