A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

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

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.