"Where the ducks walk on fish."

This general store is more than a century old and home to various oddities and antiques.

True to its name, this little house presents like a dollhouse, and surprising details are revealed with a quick peek through the window.

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

The "All-Seeing Eye of God" symbol on this library is a clue to one of the many former lives of this building.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

Extraordinary objects lurk in this quintessential regional museum.

This former tuberculosis treatment facility now stands at the center of a public park.

Endless rows of boxes of paper records line the hallways of the archaic federal facility where guns are traced.

A small granite block at this monument's base is the only part of Lincoln's Tomb outside of Illinois.

A giant time capsule not scheduled to be cored until 2040.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

Once damaged by Hurricane Agnes, this bridge is now on the National Register of Historic Places.

A tiny one-room church built after one man's prayer for healing was answered.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

Where the oil industry began.

The oldest remaining authentic Putt-Putt course that Donald Clayton created in Ohio.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

Winding country roads in eastern West Virginia lead to an extraordinary place populated by fiberglass giants.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

Catch a ride through the Pennsylvania countryside on this historic narrow-gauge railroad.

The site of America's first commercial oil well essentially disappeared after the town went bust.

The oldest automobile museum in the United States.

For decades, it has disappeared and reappeared as water levels rise and fall.