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

This snug medieval lane is one of the narrowest streets in the world.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

A striking symbol of the Bulgarian capital.

Sofia's legislative center is continuously reinventing itself.

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

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Geological storytelling.

Cliffside houses provide a spectacular view from their perch above the valley.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

An outsider folly near Madrid.

A huge cathedral single-handedly constructed by one eccentric monk.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

Commonly acknowledged as the only public monument to the Devil himself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.