The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

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

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Breathtaking and huge 430 year old maps of Italy.

These spartan apartments are provided to clergymen visiting Vatican City.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

This cheese shop also houses a museum devoted to Dutch dairy.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

This Dutch art piece became a Russian icon.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Atop this former dutch railway office sits an interstellar work of art.

A bridge that has seen many reiterations over its lifetime.

Inside this metro station is a section of the city's former medieval fortification.

A huge teapot illuminates a home for the elderly.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

A dramatic art installation features a BMW flying out of a building in Rotterdam.

This historic Amsterdam bar used to accept sailor's monkeys as payment.