The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

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

The romance of early commercial flight still fills this Art Deco destination.

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.

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

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

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

The only recreation of William Shakespeare's indoor playhouse.

At 207 feet, one of the world's longest continuous escalators.

America's first public mental health facility.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Outsider art meets paleontology at this roadside reptile repository.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

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

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

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

An eerie, decaying ghost town destined to fade into the forest.

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

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

A hidden alley in urban Baltimore is a haven for graffiti artists.

A museum dedicated to exhibiting remarkable outsider art.