This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

These vibrant row houses are a unique example of Baltimore kitsch.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

The former home of the man whose radical ideas changed the nation.

The first national memorial to honor all women suffragists stands on land where suffragists were once imprisoned.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

The most accurate timepiece in the world.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The only tennis court that falls under the jurisdiction of the central bank.

The site of the climactic scene from the classic horror film is now a historic landmark.

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.

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

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

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

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

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

A nostalgic bibliographic gem.

This statue of the "father of television" stands prominently in the United States Capitol.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.