Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The world's oldest continuously operating airport was founded by the Wright Brothers.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

America's first federal monument.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

An original apothecary from 1792.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

The system of air guns are fired off remotely to scare any trespassing avians.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

Right next to departures—how convenient!

A super-sized promotional trick that is now a D.C. landmark.

There’s a special club house at the top for the bell ringers.