This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

The world's oldest bookshop still in operation.

This small chapel is built of human bones and decorated with a golden skeleton.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.