Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Op-art architecture designed for happiness.

Handsomely crafted representations of our round planet.

Dine amidst exotic plants at this former royal greenhouse.

The topiary maze at the Habsburg hunting lodge.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

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

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

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

A geological oddity topped with a 2,000-year-old pagan temple.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

Defy gravity at this fascinating Pyrenees overlook platform.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

What happens when you cross a mayor and a painter?

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.