One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

Baltimore's first skyscraper may be home to the inspiration behind pulp fiction's most celebrated bird.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

This methodist cemetery is slowly receding into the wilderness along a Maryland highway.

This marker at the entrance to the Humphreys Engineer Center honors the former Chief of the Army Corps of Engineers.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

This statue honors the author's groundbreaking family story.

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

Once the largest trading firm of enslaved people in the U.S., this building is now a museum that preserves Alexandria's dark past.

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

The former home of Thomson Francis Mason, the mayor of Alexandria from 1827-1830.

This cannon dating to 1755 has stood guard at this suburban intersection since 1915.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

This Federal-style plantation house was once visited by Abraham Lincoln to meet with generals during the Civil War.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The former home of the man whose radical ideas changed the nation.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

This train station inspired the name of a 1970's rock band and provided the backdrop for their album cover.

The Aldie Gristmill was once the largest factory of its kind in Loudoun County.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.