Tiny communists hammer away on the Olomouc Astronomical Clock.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Op-art architecture designed for happiness.

The "Prussian Versailles" that is as glorious today as when it was built.

Cold war icon and onetime "hole" in the iron curtain.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

When the rain falls, this drain system turns into a musical instrument.

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's tiniest statue is of a small boy looking at the Moon.

Stockholm's deepest subway station is also a stunning ecological wonder.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

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

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.