Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

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

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

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

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

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

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.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

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

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

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

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

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A graveyard that dates back over 200 years stands near a busy shopping center.

A whopping 14,000 copper coins cover this miniature fighter jet.

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

The hide of Stonewall Jackson's equine sidekick is on display not far from where the ashes of his bones are buried.

Burke’s oldest cemetery also houses the victim of the county's grisliest murder.

A former waterfront market is now in the center of town due to some interesting Boston engineering.