An icy lake tucked among jaw-dropping alpine panoramas.

Historic medieval fortified city in southwest France.

Pilgrimage site for star-crossed lovers.

2300-year-old Roman road connecting the empire.

Stalactites and stalagmites in a beautifully lit cave.

An unusual bronze bus shelter is actually an art installation commenting on the city's history with the Nazi party.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

A mocking tribute to the past and modern leadership of Prague.

Trimmed trees grow alongside the graves like topiary tombstones.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

An ancient knight and a symbol of the city's freedom.

Island wonderland for communist autocrats.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

Certain traditions prevail on the least-visited island of the Aran Islands.

A hugely vast Irish landscape of barren rock that stretches for miles.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

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

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A giant red chair bolted to a rock on a remote mossy hillside in Iceland.