The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

Space-age monument to an early 20th-century uprising.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

A giant portrait of an ancient king looms over the river.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

Stone pillars and a petrified wedding party in the hills of North Macedonia.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

Structure built from the skulls of vanquished foes.

A collection of art from Bulgaria's time as a communist state.