The oldest continuously operating fish market in the United States.

A super-sized promotional trick that is now a D.C. landmark.

The national park was once a plantation estate.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The trials and tribulations of marking Poe's grave.

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

The fairy tale castle of the "fairy-tale king."

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

This colorful West Virginia cowboy greets passersby with a glassy stare.