Engineering ingenuity during the battle of Gibraltar.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

Europe's oldest still-operational tea farm also boasts a spectacular view.

Legend has it the lovelorn tears of a princess and a shepherd boy formed the blue and green twin lakes in the Azores archipelago.

This abandoned five-star hotel is now a five-star urban exploration destination.

Founded in 670, this ancient mosque is an architectural time portal.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

One of the tallest waterfalls in Africa is also home to a population of monkeys who enjoy the waters and the occasional guest.

A fortified city, home to a remaining population of five families

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

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

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

A little sculpture with a large wardrobe.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

Climb inside an iron crystal magnified 165 billion times its normal size.

Christ's blood allegedly preserved in a Belgian town.

A beer pipeline runs beneath Bruges.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

The vast, legendary catacombs hold secrets much stranger than stacked bones.