A fine, large-aperture telescope available for public use.

A stunning landscape of bunkers that once stored chemical weapons.

The mayor made the declaration in 2004.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

The narrowest house in America is seven feet of pure spite.

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

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

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Jail from the 19th century that was built by inmates.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A town's monument to a touch-football victory 50 years in the making.

Over 75 historically themed murals grace the walls of a small Washington city.

The longest and widest floating bridge in the world.

People come from across the globe to swim in this lake believed to have healing properties.

This metallic stampede sits frozen on a Washington ridge yet the artist's vision is still incomplete.

Nuclear reactor created the plutonium used on Nagasaki.

This famous bridge twisted itself into oblivion, but not for the reason you might think.