The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

The stunning interior of this Gothic church is covered in ornate gold details.

Ancient catacombs form the foundation for this Rococo orgy of a church.

You can cross from one country to another in a single hop on this little bridge.

This star-shaped military outpost is now simply trying to protect itself from neglect.

A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The corpse bride of Portugal.

This crumbling Portuguese ruin overlooks the populace it once ruled.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

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

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

The best place in the world to buy tinned fish.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This Funeral Hearse Museum represents the finest in cadaver transportation.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.