Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This massive subterranean fissure is known as the "underground Grand Canyon."

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

This 19th-century fountain's namesake animal isn't what you think it is.

Abandoned Nazi train station turned underground astroparticle laboratory.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

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

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

This chimerical bridge/tunnel appears to dead end right into the sea.

The cheese slicer may be a Norwegian invention, but the biggest ones in the world are found in Sweden.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

This solitary convex mirror sculpture at an abandoned ferry station at the edge of a fjord reflects the scenery back at the viewer.