An underground city of salt.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

When the rain falls, this drain system turns into a musical instrument.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Looming communist pillar with a Czech twist.

Climb inside an iron crystal magnified 165 billion times its normal size.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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