Europe's largest collection of matchbox designs is a fascinating exploration of the cultural history of the world.

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

This ancient Corinthian helmet is South Korea’s only national treasure of Western origin.

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

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

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

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

One man's remarkable private collection of art from around the world.

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

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

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

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

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

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

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

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

The world's oldest bookshop still in operation.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

This unassuming layer of clay boasts an out-of-this-world origin story.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

Even with only two residents and one building, this tiny Illinois town is famous for its burgers.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

A steeple in the shape of a golden hand pointing straight up commemorates Zebulun Butler, the first full-time pastor of this Mississippi church.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.