A museum in the childhood house of a medical pioneer.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Once the home of a hermetic monk, this cave now houses a small church.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

A subterranean house of worship carved right out of the bedrock.

The enormous isokinetic structure hangs within a science center in Estonia.

For the last century, this international border within a small town has appeared and disappeared various times.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Mysterious craters may have been home to an ancient cult.

A castle perched precariously over the Crimean Sea.

Over 300 wood sculptures depicting characters from Slavic, Greek and Western folk tales fill this magical garden.

A little sculpture with a large wardrobe.

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.

The Habsburgs' royal collections of art and wonders.

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

The topiary maze at the Habsburg hunting lodge.

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

This former insane asylum now holds a pathological anatomy museum.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

A phallic shrine to a princess goddess in Krabi, Thailand.