Italian cave with exceptional acoustics and an unsavory history.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

The world's most active stratovolcano is almost always erupting.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

This elegant black and white striped arch is emblematic of Catania's resilience to natural disasters

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

"Holy Wisdom" overlooks the city that became its namesake.

A vast Communist-era exhibition space in the Bulgarian capital.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A striking symbol of the Bulgarian capital.

This Transylvanian church has changed its denomination four times.

Rest stops along this pathway offer some of the best views of the Acropolis of Athens.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

Backwards hour and minute hands and a timing mechanism that fluctuates with the temperature led to this clock tower's local nickname.

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

This feat of Brutalist architecture is also known as the Three Sisters.

A pair of connected skyscrapers form this symbolic gateway.

Bridge that died in war and was resurected.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

Oriental bazaar in the heart of Sarajevo.

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

Legend has it fairies gathered at the site of this medieval castle.