A local prank turned town icon.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

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

The resting place of a Civil War celebrity's amputated limb.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

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

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

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.

An astounding collection of medical specimens, including bits of President Lincoln.

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

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

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

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

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

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

A haunting tribute to pioneering photographer Clover Adams.

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

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

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