This unique building in the main square stands out among the city's typically Baroque architecture.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

For many years, the river that Julius Caesar led his army across into Italy was lost until re-identified.

The San Marino-Rimini railroad was short-lived but this tunnel once provided shelter for hundreds of refugees during World War II.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

Where members of the Crossbow Corps of San Marino demonstrate their skills.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

A diverse collection of wax, bone, papier-maché and mummified relics.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

St. John the Baptist's forearm is housed in this remote 11th-century monastery.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

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

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

This 15th-century Ottoman bridge was modified to keep up with the changing course of the river Erenik.

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

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

Depending on the region's rainfall, this church may be partially submerged.