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

A striking symbol of the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

The unusual sculptures are believed to be powerful political symbols.

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

A misnamed well, with a deep dark past.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

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

This scenic fortress dates back at least 2,400 years to the time of Magna Graecia.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

Climb the dead electric pylons of Messina.

A small Byzantine church lost in the middle of the mountains of southern Italy.

Two of the few remaining life-sized Greek bronzes were submerged in the sea for over 2,000 years.