One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The facade of this bank has changed little over the centuries, including its unique welcome sign.

It's believed that these columns marked the end of the Via Appia.

Europe's first floating restaurant is home to a hilarious legend.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Baroque celebration of the end of the Great Plague of Vienna.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Quite possibly the oldest love poem known to humankind.

A fountain standing as a testament to a doomed alliance.

A tiny park in the middle of some big power politics.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

The ancient latrines of the Greeks, in all their public glory.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

A decomissioned facility where the German "Transrapid" maglev trains were once tested.

The Suurhusen church tower in Germany leans over farther than the famous Leaning Tower of Pisa.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

Sound travels strangely in this underground whispering gallery.

A heated statue pays tribute to one of Sweden's great actresses.

A concrete mushroom that divided Stockholm residents for nearly a century.

This group of small islands on Lake Nicaragua formed after an eruption of the Mombacho volcano.

A lakeside footbridge that records Nobel Prize laureates' names in metal silhouette.