A spherical "micro-nation" in the heart of Vienna.

An ornate private entrance to the Vienna subway built specifically for the emperor.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Designed as a reminder of one of the darkest moments in Austrian history.

More than a millennium's worth of municipal records preserve the political history of Austria.

Apartment complexes built into huge repurposed natural gas tanks.

No one knows the origin of this creepy little stone man with an oversized phallus.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

The largest fountain in Bratislava.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

A massive sculpture of an obscure Celtic coin that has become a symbol in Slovakia.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

A once-fairy tale mansion now stands in a state of disrepair.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.