An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

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

Parking garage where Bob Woodward met Watergate source "Deep Throat."

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

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

Obscure Freemasons still live in D.C.’s largest private residence.

This lovely pocket park is one of the most under appreciated in D.C.

Go take a picture with the inventor of the daguerreotype photographic process.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

A much-maligned monument to teetotalism.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A clone of a cloned tree that was so important it allegedly had its own guards.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

Art deco landmark on the outskirts of Washington, D.C.

An Industrial Revolution-era public work that purified water using nothing but sand.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

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

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

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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