A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

A historic arena where the Beatles played their first concert in the U.S.

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

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

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

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

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

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

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

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

Where the U.S. government kept its actual treasure, before Fort Knox.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The "lovely red Vega" of the legendary record-settling pilot.

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.

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

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

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

The privately owned cemetery that holds room for Washington's finest when they step down from life.

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

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.