A beautiful oddities shop crammed with strange and morbid curiosities.

There aren't too many operational funiculars around, but Pittsburgh has two!

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

The final resting place of the famous Rhode Island lighthouse keeper who heroically saved dozens of people from drowning.

Mysterious stone tower featured in many alternative histories of the New World.

A 60-room castle constructed by a horse-racing heir.

The widow of Benjamin Franklin's brother became the first female newspaper editor in the United States.

World's first "penitentiary," meant to be humane, drove men insane.

Eco-friendly island mansion.

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

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

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

A trompe-l'oeil statue honoring the first guide dog in North America.

A small cave hidden deep within the Jenny Jump State Forest.

Take a step into the workshop where Edison and his employees revolutionized the world.

A farm in New Jersey grew a most unusual crop for AT&T's testing purposes.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

Local lore claims this park is named after a young woman who jumped off a cliff.

The rusting remains are visible sticking out of the waters of the Delaware Bay.