Pilgrimage site for star-crossed lovers.

The video game-themed street art first popped up in the French city.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The celebrated eyesore created by starry-eyed sweethearts.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

The tomb of the mythological founder of Padua is not hidden in some obscure crypt, but stands right in the middle of the city square.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

100 year tradition of fist fights, marked by marble footsteps.

Where Venice's gondolas go for a tune-up.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

This one-time health resort was used by aristocrats around the world.

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

The oldest public library in Ireland.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

This tree was extinct for a thousand years before sprouting again from a 2,000-year-old seed.

A massive, heart-shaped, wind-carved crater in the middle of the Israeli desert.