This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The national park was once a plantation estate.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

A walk through the historic city center, under the streets of Seattle.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Dramatic river bend surrounds a natural red-rocked pedestal.

An eerie, derelict amusement park in Berlin.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

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

A crumbling hospital from the 1850s on Roosevelt Island.

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

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