This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Baroque celebration of the end of the Great Plague of Vienna.

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

The beautiful baroque library of the Hapsburg empire.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

A 26-foot shark sculpture—a statement about bombs—set off a municipal battle royale.

This 11th century tower is said to be the oldest building in Oxford.

One of Oxford's greatest treasures likely belonged to England's legendary King Alfred the Great.

Used as an example in one of the first dictionary entries for "museum" in 1706.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

Preserved baths in a Victorian-era spa town frequented by the most famous people of its day.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

Museum about life, death, and cannibalism in the Stone Age.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The largest greenhouse in the world is home to over one million types of plants.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.