This taxidermy horse was a Civil War hero.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

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

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

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

The hidden offices underneath Memorial Bridge have been locked up since 1976.

The Lincoln Memorial has inspired many, even though a word on the inscription appears to be spelled incorrectly.

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.

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.

Engraved in stone here are the signatures of everyone who signed the Declaration of Independence.

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.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

This nine-story building is the oldest standing skyscraper in D.C.

Once home to the largest photo service in the United States.

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

This mobile theater show highlights the story of Hershey through fun facts, unique stories, and plenty of candy samples.

Themed gardens, a conservatory, and a rose named for Milton Hershey, all overlooking Hersheypark.

This Civil War monument was designed by an eccentric architect and Gettysburg veteran.

This Pennsylvania structure, the oldest building in Gettysburg, was once a stop on the Underground Railroad.

This is the spot where the bloodiest battle in the American Civil War may have started.

This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.