Though much of the castle was robbed of its stones, the underlying earthworks are among the best-preserved in England.

The Andean town where every single building is decorated with a brightly colored frieze.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

The vibrant buildings in the “capital of the comic strip” celebrate the art form that made it famous.

Banksy's image of a naked man dangling from the window of a sex health clinic.

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

Strange beasts lurking in a garden are all that remain of a quirky, short-lived theme park.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

This banal Parisian entranceway is not what it seems.

A French artist's vague warning hangs over Belleville.

Ordinary art transforms to extraordinary thanks to locals' quirky sense of humor.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

The legacy of a Moroccan Jewish community is remembered at this little mouldering cemetery.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

Morocco's Argania trees are infested with nut-hungry goats.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

This Croatian computer club features such gaming relics as the infamous Virtual Boy and an 8-bit Pacman machine.

This heart-shaped island looks substantially less lovely after a recent bulldozing project.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

An ancient knight and a symbol of the city's freedom.