A tree planted by Marie Curie is treasured by the Radium institute that she set up.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A cemetery for Slovenian notables also serves as a popular recreation space.

This small Slovenian town has become a magnet for microbreweries.

Nibble as you learn about Slovenia's longstanding tradition of making beautiful honey cookies.

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

This massive subterranean fissure is known as the "underground Grand Canyon."

This wooden hotel is a temple to German sustainability and forest conservation.

A fascinating little museum dedicated to the thousands of chemical substances concealed in our food.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

A portable, wooden replica (minus the hyphen) of Hamburg’s iconic crooked coffee shop.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

An eerie, derelict amusement park in Berlin.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The decaying remains of a 1960s mechanical wonderland that never officially closed.

This Danish castle is supposedly haunted by a woman too independent to not be a witch.

Four alabaster giants contemplate the tides on the shore of Denmark.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

A delightful but little-known public observatory and planetarium in Munich.

A small square plaque marks a failed assassination attempt that could have changed history.