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

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The most accurate timepiece in the world.

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

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

A spectacular tribute to statesman and philanthropist Andrew Mellon.

It was once the base for a series of domestic terror attacks.

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

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

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

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

Perhaps the most scandalous statue of America's first president.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

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

The National Park Service’s best-kept secret with views that rival any in D.C.

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

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

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

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

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

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