An old spa town in the mountains of Romania where, according to legend, the great hero Hercules once bathed.

A strange rock formation with numerous legends trying to explain it.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

This fortress-like monastery is covered with intricate frescoes.

This ferry carries passengers across the Rhine propelled by no engine or paddles but by the river's current.

This impressive chasm is one of the longest natural underground cavities in the world.

In this German city center, the streets have no names.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

An unfinished Serbian Orthodox church with 1,389 golden crosses planned to represent the Battle of Kosovo.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

A monastery considered a state-protected cultural monument of exceptional importance, founded in the 14th century by Serbian King Stefan Dečanski.

From Carthage's Hannibal to riders of the Tour de France, many have crossed this scenic route through the Alps.

This skyscraper once housed weapons during the revolution and was the scene of two brutal crimes that shocked São Paulo society.

The most impressive of Basel's three remaining city gates.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

Huge stairway leads to this massive gallery.

A UNESCO-protected spiritual seat of the Old Serbian Kingdom and Empire.

A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

Epicurean and holy traditions converge in what may be the oldest restaurant in Europe.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

This lonely minaret with an unusual decorative symbol is all that remains of a historic Ottoman mosque.