This medieval footbridge in the Swiss Alps is known to attract cliff-jumping daredevils.

If James Bond bungee-jumped off the side of a 720-foot dam, would you do it too?

The world's longest and deepest train tunnel.

Study the Alien etchings in this fountain while you refill your water bottle.

Bell tower juts out from a village buried under a lake.

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

This small, easily-overlooked sculpture recalls the first time Graz saw a live elephant.

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

Legends surround an ancient tree trunk riddled with nails for good luck.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

Baroque celebration of the end of the Great Plague of Vienna.

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

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Op-art architecture designed for happiness.

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

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

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

When this monument to Slovenia's national poet was erected, it's said to have sparked the ire of nearby church authorities.

A public work of art that also provides some relief from the summer heat.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

A small museum built by a family that survived the Siege of Sarajevo.