Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

The Swedish flag over this small naval fort signals that the nation is at peace.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

This chimerical bridge/tunnel appears to dead end right into the sea.

Swedish skyscraper with a 90° twist.

The dome-shaped reservoir of this old water tower produces unique acoustic effects.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

A modern, secular take on a traditional Virgin Mary motif.

Stockholm's deepest subway station is also a stunning ecological wonder.

Countless grotesque faces stare out from this eerie Prague art wall.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A curious cave church carved into the face of a cliff.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

A tiny church on a man-made island in the Adriatic.

A tribute to a man who defied the Nazis until his last breath.

A pair of connected skyscrapers form this symbolic gateway.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A misnamed well, with a deep dark past.

Virgil's many-mouthed gateway to the underworld.

Ruins of a 10th century church tucked away deep in a botanical garden.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This irregularly shaped sea fortress has defended not one but three different sovereign states.