This water tower commemorates the invention of the transistor on this site in 1947.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This historic Victorian mansion is allegedly so haunted that a signed waiver is required to enter.

This sign marks the start and end of Matt Green's nearly 10,000-mile quest to walk every block of every street in New York City.

This stately brick building once provided supplies and equipment to lighthouses across the northeast during the 19th and 20th centuries.

Rare recess caves fill this unbelievably beautiful Ohio park.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

The castle still holds traces of the abandoned Roman fort it was built atop.

Stroll through Welsh history in a village of reconstructed structures.

Recently restored menagerie of Victorian-era beasts.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The ruins of a once-grand mansion in Northern Ireland are now thought to be haunted.

The atmospheric road was never meant to be so creepy.

A derelict hunting lodge that was once the site of aristocratic debauchery.

This tribute to the fictional detective stands at the famous literary character's address.

This educational institution and reference library specialize in the psychic arts and mediumship.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

Marie told fortunes from her small stand on the Boardwalk for decades, including to a young Bruce Springsteen who would busk outside her booth.

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

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

The video game-themed street art first popped up in the French city.