Underneath this small church are 15,000 bones, arranged by an obsessive academic.

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

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

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

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

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

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

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

The topiary maze at the Habsburg hunting lodge.

Ham is serious business at the Prosciutto Museum-Serious, delicious business.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

World's largest permanent maze made of 18,000 conifers.

Tallest - but not most powerful - wind turbine in the world.

A tiny basalt mountain with an observation tower overlooking the beautiful Bavarian countryside.

According to legend a man pooped out the window of this tower to prove that it was straight.

The oldest trees in Northern Germany.

This small town in Germany was once a center of peppermint production, and has the museum to prove it.

Four-story slides send people whizzing through the math department at this Munich university.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

The only remaining U-boat that is still floating never actually saw any action in World War II.

Giant wind turbine with observation deck at the very top.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

The prison where Hitler wrote "Mein Kampf," and 278 Nazis were later executed for war crimes.