The span is crooked and made from two older recycled bridges.

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

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

A historic ruin just 20 feet away from a busy highway onramp.

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

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

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

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

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

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

The most accurate timepiece in the world.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

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

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

There's a crumbling old mansion inside the Smithsonian National Zoo.

The oldest continuously operating fish market in the United States.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

The house where John Wilkes Booth conspired with his co-conspirators.

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

A haunting tribute to pioneering photographer Clover Adams.

The national park was once a plantation estate.

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

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