This tower once served as a radar station during the Cold War.

These small, triangular, colorful houses are a staple of Madeira Island.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

A lush oasis full of vibrant plants and striking geometric displays.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This historic floating crane became an unlikely symbol of the port of Trieste.

One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

The "Mona Lisa" of funerary art.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.