Home of the only civilian casualty at the Battle of Gettysburg.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

Cat art as far as the eye can see.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

A beautifully eclectic mix of architectural styles.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A tribute to the truly loyal dog who waited outside a hospital for his owner to come back.

An overgrown and abandoned tuberculosis ward resides in the midst of a quaint modern neighborhood.

The tragic tale of the dentist who pioneered the use of anesthesia.

This location of a Mexican chain restaurant has a unique location: an old jail.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

A historic Black graveyard hidden in the parking lot of one of America's largest malls.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

The real-life site of Ichabod Crane's infamous gourd attack.

This store also houses a museum dedicated to the history of these small, historic community shops.

The oldest living cultivated fruit tree in North America.