Hidden beneath the streets of London is a secret subway that only carried mail.

A fitting attraction for the corn capital of the world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

Lie in a hammock where George Washington stood.

100 massive sculptures in the Hudson River Valley.

“Invented in Key West, Perfected in Brooklyn."

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

New York's oldest magic store.

Despite not growing anywhere near New York City, bananas are ripened in a pressurized room in the Bronx using precise banana science.

Malaysian fireflies create a dazzling display as thousands light up in unison.

The fairy tale castle of the "fairy-tale king."

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

These Stalin-era industrial 'death traps' hang lifeless above the city

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

These passages carved from the Antarctic ice hold strange shrines to the harsh southernmost climes.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

These jagged limestone blades cut out through the canopy of the jungles of Borneo.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.