Arrr! The most authentic collection of pirate artifacts in the world... matey.

This Cape Cod museum exhibits what it claims is the only authenticated pirate treasure in the world.

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.

A daybeacon pyramid is about all that's left of this island that is said to have sunk due to a pirate's curse.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

A maritime museum holding the remains of Blackbeard's pirate ship.

The oldest still-operating tavern in the United States was once owned by a pirate.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The former home of the world-famous Templeton Carpet Factory.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

These ruins have been linked to a sherbet factory that exploded, but the story may be entirely fictional.

This memorial commemorates a defining 16th-century battle between English and Scottish forces.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The healing properties of this well attracted royals and commoners throughout the Middle Ages.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The oldest residential street in Europe also features an optical illusion.

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

This Copper beech tree nestled on a nature reserve is host to a bevy of autographs from Irish literary icons.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

A corkscrew-shaped barn in Ireland.

The ancient tomb acts as a calendar that keeps perfect time.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.