A former ironworks that was the first UNESCO industrial site.

One man's stunning attempt at eco-friendly living.

Today this former Nazi concentration camp stands as a poignant memorial to the victims of fascism, and a warning from history.

Germany's longest suspension rope bridge.

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

The great Danube river starts here.

One of the highest mountain passes in Europe has been ranked among the best driving roads in the world.

Crumbling ruins of the thermal baths that once attracted royals and aristocrats from throughout Europe.

With its mine closed, this old village is starting to resemble a ghost town.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A public work of art that also provides some relief from the summer heat.

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

Humble beginnings for one of the world's most famous scientists.

A unique two-level bridge designed to honor a king.

Bridge that died in war and was resurected.

This abandoned airplane hanger is said to have once been a top secret launch facility.

In this town's main square resides a statue of none other than the 43rd President of the United States.

Decorated with a staggering 1,380 ladybugs, the installation has turned what was once a grim, forgotten nickel mine into a landmark and a statement.

It's unclear what caused the fire that led to this opulent hotel's demise.

This historic black and white monastery is one of Bulgaria's architectural jewels.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.