According to a local legend, this old castle could only be built after a woman was immured in the walls.

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

A naturally beautiful, seemingly bottomless deep blue spring.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

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

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.

On the outskirts of an opal-mining town, these baths fed by a massive underground aquifer are a natural spa.

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

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

What happens when you cross a mayor and a painter?

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

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

A church of bones, decorated with 40,000 human skeletons.

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

This medieval church in a small Austrian village is home to a 700-year-old Mickey Mouse lookalike.

An IT-specialist-turned-farmer reintroduces an Austrian food tradition while promoting snails as a sustainable "future food" option.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

The medieval "dragon" on an Austrian city's coat-of-arms comes to life in a fountain.

Narrow-gauge railway with its own personal power grid.

This "mathematical tower" was an observatory, early skyscraper, and place to reflect on all of nature and the cosmos.

The site of Austria's biggest concentration camp now honors its victims.

Bizarrely-painted church designed by a controversial artist.

This splendid tomb may look fantastic, but there's nothing in it...

An ornate private entrance to the Vienna subway built specifically for the emperor.