Secret refuge and museum of the Duke of Florence.

This abandoned Brutalist treehouse is a hidden architectural relic.

Pilgrimage site for star-crossed lovers.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

In one of the world's smallest countries, a royal's personal winery is open to the public.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

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

A breathtaking viewing platform over the Alps.

This cubist Vienna church building looks like some sort of alien stonehenge.

The topiary maze at the Habsburg hunting lodge.

The Habsburgs' royal collections of art and wonders.

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

Dine amidst exotic plants at this former royal greenhouse.

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

An exquisite Baroque church in Vienna's old town.

This former insane asylum now holds a pathological anatomy museum.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

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

Go inside to really appreciate this 500-year-old technological masterpiece.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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