The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

Exact replica of the ancient monument, but much, much lighter.

This pun was simply waiting to come to life, and one defense contractor made it so.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

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

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

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

A former major munitions plant that has been converted into a sprawling art space.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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

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

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

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.