The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

There’s a hidden military meme engraved on the World War II Memorial.

Decades before the scandal, this staircase on the river was a literal "water gate."

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

Obscure Freemasons still live in D.C.’s largest private residence.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The headquarters of a secretive order is also a beautifully-designed park.

An extensive collection of ancient Egyptian artifacts and mummies.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A surreal statue honoring Prague's favorite literary son.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

The first museum in the world devoted to sexual gadgetry.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.