This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

A spherical "micro-nation" in the heart of Vienna.

The topiary maze at the Habsburg hunting lodge.