The world's first aircraft factory has been hiding inside an automobile plant for almost 80 years.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

The first (but not only) upside-down house in Germany.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

One of the most easily accessible examples of the rare 1960s UFO houses.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

Legendary site where an evil bishop was devoured by rodents.

A fearsome dragon clings to a corner of Munich's city hall.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Enter the cabin of a life-sized Hindenburg replica.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

This painted Lego bridge is the product of over a century of locomotive history.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

An eatery for UFO seekers on the Extraterrestrial Highway.

The world's largest military aircraft cemetery.