Climb inside an iron crystal magnified 165 billion times its normal size.

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

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A miniature city, once ruled by the Queen of the Netherlands.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

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

Collection dedicated to brands, packaging and advertising.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A fountain standing as a testament to a doomed alliance.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A surreal statue honoring Prague's favorite literary son.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A mocking tribute to the past and modern leadership of Prague.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Two stunning 17th-century libraries and a cabinet of curiosities.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

This man-made mound monument was built out of soil from all across the Polish empire.