Dine amidst exotic plants at this former royal greenhouse.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

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

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

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

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.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

Narrow-gauge railway with its own personal power grid.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

Cross mysteriously appeared for 36 years.

"World machine" built by an untrained Austrian farmer.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

Home of controversial poet priest who penned the words for the Austrian national anthem used in the 1930s.