The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

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.

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

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

The national park was once a plantation estate.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

At 207 feet, one of the world's longest continuous escalators.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Time travel with sweets across history at this research-based candy store.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This train station inspired the name of a 1970's rock band and provided the backdrop for their album cover.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This former train station was once an important shipping depot for the regions farmers.

This pun was simply waiting to come to life, and one defense contractor made it so.