The stunningly blue waters of these beautiful caves also have a violent past.

There is only one place in the world where the corners of four nations come together.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

This Michelin-starred restaurant sheds light on a rare period of cultural and culinary tolerance in Cordoba’s past.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

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.

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

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

The first museum in the world devoted to sexual gadgetry.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

The topiary maze at the Habsburg hunting lodge.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.