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

Sweden's oldest animated sign is still lighting up the skyline today.

One of the world's first dedicated bank buildings in the world is now the oldest one.

A man has revenged his true love's betrayal through tears and stone genitalia.

Stockholm's narrowest alley is barely over two feet wide.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

This Parisian gem is one of the most incredible ethnographic museums in the world.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

An abstract monument to a symphonic composer.

A subterranean house of worship carved right out of the bedrock.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

Now home to a drinking establishment, this building has a macabre history.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A floating cat sanctuary on an Amsterdam canal.

Inside this medieval church resides a unique set of murals.

World's strongest whirlpool.

The man who helped establish the first rules of golf.

This tablet indicates where the tragic monarch returned to begin her tumultuous downfall.

This lesser-known leaning tower is all that remains of the medieval castle of Vernazzano.

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.