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

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.

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.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

A statue honors the children who fought Nazis in Poland.

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

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Colorful and chaotic stacked hotel in North Holland.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

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

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

The abandoned Bermudian home of a British naval leader is surrounded by crumbling sporting fields and the graves of convicts.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

The only museum with its curator—and her pets—buried inside.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Geometry and mystery come together in an epic show of octagonal masonry.