The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

This small pedestal marks the spot of the first lot of land sold in Alexandria, Virginia in 1749.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

The 92-foot-tall structure is based on the aircraft that carried the first Americans into space.

A recreated sign from the movie Jumanji has become a makeshift tribute to the film's late star.

This historic mini-suspension bridge was swept away once but is now here to stay.

According to local history, this cast-iron canine was nearly melted down for bullets during the Civil War.

Rumors persist that a bottle of whiskey is sealed within this Demijohn-shaped adornment.

Home of the only civilian casualty at the Battle of Gettysburg.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

A haunting tribute to pioneering photographer Clover Adams.

A memorial to a shareholder activist feared by CEOs around the United States.

Mysterious installations bring levity and light to a sometimes stodgy city.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

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

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Dedicated to the man who created the first radio wave communication system.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.