This 15th-century island fortress later served as home to the executioners no one wanted to live near.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Structure built from the skulls of vanquished foes.

Humble beginnings for one of the world's most famous scientists.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Stone age urban planning.

A misnamed well, with a deep dark past.

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

A pair of connected skyscrapers form this symbolic gateway.

Festival of Perpetual Life and Rebirth.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.