This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

The last intact steam engine factory in the United States.

This university research project is the U.S. government's weed dealer.

This historic general store still operates much as it did in the late 1800s.

Elaborate hand-carved wooden clocks two brothers made in their spare time are on display at this handsome little museum.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

This secluded walking trail is a hidden gem of a Pittsburgh park.

One of Philadelphia's largest murals resides hidden under this bridge.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

Colorful collection of antique musical oddities.

The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

Originally a cemetery, this city park remains speckled with a handful of scattered gravestones.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

Dozens upon dozens of boulders engraved with scripture tell the story of one man's troubled life.

Alexander Hamilton’s creation caused quite a bit of controversy.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

The abandoned coal loading dock is a canvas for unsanctioned art.

This elaborate towering structure was once famed for its revolutionary height.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.