A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Copenhagen's celebrated theme park and gardens.

2300-year-old Roman road connecting the empire.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Fortified medieval tower house with lovely roof garden.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

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

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

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.

The oldest botanical garden in the world that technically isn't the oldest.

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

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.

Go inside to really appreciate this 500-year-old technological masterpiece.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

Artist Diego Morlin's war between the natural and human worlds is a wanderer's delight.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

A macabre anatomy museum tucked within an old Italian hospital.

Pilgrimage site for star-crossed lovers.