These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

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

This hidden collection of everyday objects illustrates life within communist Poland.

Somber memorial to the May 10, 1933, book-burning which took place on this spot.

Fantastic views and thousands of love locks.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

Once home to some 250,000 volumes and priceless art artifacts, this Polish estate was a target of bombing during World War II.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

There has been an astronomical clock on this spot since the 14th century.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

Remnants of the Roman empire's northern frontier nestled in suburban Glasgow.

Once used to protect important Roman trade routes.

The largest municipal cemetery in the United Kingdom and the second largest in Europe contains some of Manchester’s biggest characters.

This 19th century police station now puts the history of the Manchester City Police on display.

A giant wooden soda bottle pays homage to a distinctly British drink on the very spot where it was invented.

This small chapel is built of human bones and decorated with a golden skeleton.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

One of the oldest amusement rides in existence was a huge disappointment to its creator.

A typographic tribute to the many comedic greats who make Great Britain laugh.

Theme park featuring miniature replicas of European monuments.

A historic Georgian building and warm springs.