Architectureal fantasy quarter of Rome.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

The final resting place of the last "gypsy king" of Poland.

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

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

The world's oldest bookshop still in operation.

A perfectly preserved hill village where the buildings are painted like white lace.

A unique hotel for the artistic soul.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

An ancient knight and a symbol of the city's freedom.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

This picturesque medieval monastery guards a small trove of historic treasures.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An ethereal glowing blue ocean cave in Croatia.

Dummies recreate radiological discoveries from history.

Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

The Belgian library displays burned books that were salvaged from the fires of both world wars.

Most prolific publishing house in the 1600s open to the public.

Housing the groundbreaking maps and globes of Gerard Mercator.