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

Enormous sandstone towers loom within a Czech forest.

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

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

Slovenia's first mosque is a striking mix of Islamic and modernist architecture.

The "dragon babies" of southeastern Europe.

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

A miniature train-ride through Slovenia's largest cave system.

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

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Hidden along this old street in Antwerp is a surreal monument of a bronze arm sprouting four hands.

This interactive sculpture allows visitors to leave a message in case a friend passes by.

This legendary giant, born from vegetables, terrorized townspeople and cheated local children in games.

The legendary giant's severed hand sits on Antwerp's popular shopping street.

A man throwing a giant severed hand towers over Antwerp’s main square.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.