The two massive guns that defended Cartagena Bay.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

This cemetery features modernist statues as strange as its name.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Giant topiary dog once played a role in a terrorist bomb plot.

The world's largest wooden structure.

An ancient Egyptian temple in the middle of Madrid, Spain.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Longest canal tunnel in the world, abandoned in the 1960s.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.