The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

Science meets wall art to highlight the beauty of famous mathematical equations.

A former plague hospital turned medical museum.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

A beautiful collection of taxidermy birds and rare pomological wax models.

Go surfing on this urban wave, "hacked" by local surfers.

King Ludwig I's collection of beautiful women.

Housed in an old church, this hunting museum holds a collection of mythical bird-rabbit creatures.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Vines grow up the metal bars in this public park created from an old machine factory.

The taxidermy remains of the first brown bear to enter Germany in 170 years.

See the rare bloom of the "Queen of the Night" cactus at one of the world's largest succulent collections.

The silly symbol for an underground protest group is now scattered around the city.

This colossal couch is an unlikely monument to Europe's first female Doctor of Law.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The bears of Bern have been a city highlight for over 500 years.

Enormous, fluffy dogs frolic around this museum dedicated to a legendary Saint Bernard.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

One of the most poignant ruins of the Chornobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Museum devoted to the artificial language of Esperanto.

Ukraine's oldest operating pharmacy now offers guests a fascinating walk through apothecary history.

Enter the cabin of a life-sized Hindenburg replica.