This extensive collection covers thousands of years of Polish military history.

An enormous Polaroid picture adds an artistic flair to Rotterdam.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

A delightful museum entirely dedicated to the tiny homes of dolls.

These coffin-like Brutalist balconies were inspired by a nearby mine.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

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

Hundreds of notes give thanks to the patron saint of lost causes.

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

A statue honors the children who fought Nazis in Poland.

A simple stone remembers one of the most menacing horses in the Swedish military.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

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

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

A 20th-century picture show in 3-D.

This unusual elevator doesn’t stop or slow down.

The library's graceful rotunda is like a bibliophile's temple.

A modern reimagining of a medieval city gate.

A heated statue pays tribute to one of Sweden's great actresses.

The walls and streets of the ancient city are peppered with penises.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

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