The place where World War I began.

This beautiful Croatian fortress is haunted by legends of forbidden love.

Site of a massive 1991 ammunition depot explosion that marked a turning point in the Croatian War of Independence.

Built in 1904 as a lavish gift for a daughter, it is one of Croatia's youngest and most architecturally unique castles, blending Art Nouveau with neo-Gothic elements.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

Hilltop garden on the site of an old fortress overlooking the Mediterranean Sea.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Pilgrimage site for star-crossed lovers.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Oriental bazaar in the heart of Sarajevo.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Macabre astrological automaton clock dating to the late 1400s.

This cemetery features modernist statues as strange as its name.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

A musical instrument played by the sea.

The "dragon babies" of southeastern Europe.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

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

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.