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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

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

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

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

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.

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.

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

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

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

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

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

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

The most accurate timepiece in the world.

A celebrity from the late Cretaceous period.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

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.

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

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

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.