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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A haunting tribute to pioneering photographer Clover Adams.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

A historic arena where the Beatles played their first concert in the U.S.

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

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

The house that birthed The Old Man and The Sea is now a museum devoted to the old man who wrote it.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

The yawning remains of a complex naval fortress still haunt this Australian shore.

This secret Australian garden was built on love after a man planted a random bulb he found in the ocean.

This historic observatory contains the world's oldest refracting lens telescope.

Come for the flowers, stay for the bats!

America's Most Wanted's set resides in this tribute to the history of crime and punishment.