400-year-old garden, restored to beauty.

A fantastic castle rumored to be the birthplace of King Arthur.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This tangled English forest looks like something right out of a fairytale.

The longest hedge maze in the world.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

The world's largest collection of witchcraft regalia.

The sign at the garden gate reads: "These Plants Can Kill."

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

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

Where Venice's gondolas go for a tune-up.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

100 year tradition of fist fights, marked by marble footsteps.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

The plague quarantine island home to the alleged "Vampire of Venice."

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Venice's "Island of the Mad."