An antiquarian horologist’s mysterious home in Old Goucher.

At the birthplace of American railroading, a world-class collection of historic trains.

The former home of the "Father of Black History"

This one-time communal home of radical feminist activists was the first lesbian-related landmark on both the D.C. Inventory of Historic Sites and the National Register of Historic Places

A hidden mid-city oasis, built for pollinators amid the concrete of federal buildings

Two statues of the fictitious toy robots that ran afoul of local government

A poet’s rustic cabin, rescued from demolition and tucked into Rock Creek’s greenery

Crumbled shell of one of the oldest buildings in Virginia.

Catch rising stars of Appalachia’s music scene before they make it big at this restaurant and community hub.

This claimant to the title of "smallest church in the 48 states" doubles as an equally tiny, quasi-post office.

A cemetery and stairs are all that remains of this former church

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A farmhouse where soldiers left their marks on the walls and attic

Two columns and a path leading into the woods at Fort Bennett Park are all that remain of a custom-built, Bavarian-inspired castle

This historic train depot transports visitors to an early 20th-century world before desegregation

The art on the walls of the Mexican Electricians' Syndicate pulls no punches in its messages against capitalism and authoritarianism

This modernist church features an impressively tall mural

Hidden away in an alleyway, this diminutive chapel is said to be the smallest church in Rome

A massive engineering and hydraulic marvel dating back to the 3rd century BC

The home and final resting place of the first native-born American saint

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

A towering tribute to the Godfather of Soul.

The lesser-known lost colony of Roanoke was a safe haven for formerly enslaved people during the Civil War.