The "Key of Keys" for Washington, D.C. and the apocryphal landing place for the military campaign that started George Washington's career is now at the bottom of a well.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An overlooked memorial honoring the local Washington residents who died in World War I.

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

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

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

The most magical part of this Latin American and Caribbean art museum is a room covered in beautiful blue tiles from floor to ceiling.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

Garments from across the globe call this hidden gem home.

The hippo that stands on this university campus was once a drunken flea market purchase.

This harsh mountain path was built as a strange attempt to improve the health of Turkmen citizens.

The controversial final resting place of the equally controversial first president of Turkmenistan.

A dictator's gold statue once rotated to face the sun on a 75-meter high marble tower.

Sumptous memorial to a controversial independence.

A huge monument to a bizarre book written by Turkmenistan’s longstanding dictator.

If you want to get married in the White Marble City of Ashgabat, you should do it in this surreal disco ball building.

A fiery crater has been burning in the Karakum Desert since 1971.

These "50 Fortresses" have been unearthed in the ancient oasis of Khwarezm.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Where Stoddart and Connolly suffered in the infamous Bug Pit.