An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

This little-known national museum houses over 40,000 works of art from across the world.

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

The best place in the world to buy tinned fish.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

The world's oldest bookshop still in operation.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

One of the smallest bookstores on the planet.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

An abandoned anti-smuggling station decays along the boundary between Portugal and Spain.

The world's largest collection of witchcraft regalia.

Part museum, part piece of Arthurian-inspired history, this stately hall attracts King Arthur fans from miles away.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

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

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

Cornish legend says these ancient circles were people turned to stone for playing hurling on a Sunday.

A wonderful safe haven founded in the 1960s to rescue endangered monkeys from the pet trade.

This ruined 15th-century hermitage is steeped in myth and mystery.

The remains of one of Wales’ great medieval buildings, with a pub in the cellar.

The abandoned military base looks like a post-apocalyptic wasteland.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

This sprawling museum holds one man's giant collection of real tanks.