Unusual building appears to be haphazardly built from randomly piled bricks.

The oldest hydroelectric plant in Czechia is now a museum.

Heralded as one of the prettiest castles in all of Czechia.

One of the oldest, well-preserved water treatment facilities in all of Europe.

Visitors flock to the historic birthplace of radiobalneology for its therapeutic radium treatments.

The largest manmade caves in Europe now function as a motorbike club's headquarters.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

Enormous sandstone towers loom within a Czech forest.

This former quarry is now a picturesque gorge that hides a sunken lake.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

A spiral staircase twists to the top of this unusual Czech lookout tower.

This doorless 20th-century elevator doesn't stop or slow down.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

Island wonderland for communist autocrats.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Legend has it fairies gathered at the site of this medieval castle.

An ethereal glowing blue ocean cave in Croatia.

Inside this mansion turned museum, the works of prominent Croatian artists are on full display.

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

An architectural marvel that spans the Arda River, and has stories of a haunted past.