A rotating cast of guys and dolls in front of a Washington, D.C. building.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

This poor little statue is the most vandalized memorial in Washington.

These unusual rooms on wheels are holdovers from the 1960s.

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

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

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

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

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

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

The only Leonardo Da Vinci painting in the Western Hemisphere.

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

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

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

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

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

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

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

The national park was once a plantation estate.

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.