The place where World War I began.

Oriental bazaar in the heart of Sarajevo.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

A little sculpture with a large wardrobe.

Theme park featuring miniature replicas of European monuments.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Cozy basement bar sports an inventory of over 2,000 beers.

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

Bizarrely-painted church designed by a controversial artist.

The world's most important buildings shrunk to a tiny size.

Austria's very first and only nuclear power station was completed but never used.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

A silly medieval mural preserved on the side of a Viennese house.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Double spiral staircases are not unheard of, but they are very rare.