"Alleys of Stone" form natural mazes in Spanish natural park.

Spain's largest bullring offers a unique glimpse at architecture and history.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

A museum dedicated to the centuries-old cave dwellings that housed marginalized communities on the outskirts of the former capital of Muslim Spain.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

The water of this well in Toledo lost its sweetness after the death of a young love.

An homage to the first Spanish cyclist to win the Tour de France.

At least according to the Guinness World Records.

Geological storytelling.

A scattered cemetery of medieval tombstones, each carved with indivdual patterns and scenes, overlooking a bright blue lake.

Water gushes from the trunk of this miraculous mulberry tree about once a year.

An exquisite monument dedicated to fallen Partisan soldiers and anti-fascist fighters of Yugoslavia through symbols of gears and flowers.

A swan-like monument on Obad's Hill honors those that defended the area from German invaders during WWII.

A curious cave church carved into the face of a cliff.

A retro Yugoslav congress, cultural, and business hall built in the 1970s, with an iconic world clock.

Arguably Belgrade's only example of pure Art Deco architecture.

An eerie fountain commemorating the death of a boy that sparked a small war in the 19th century.

A NATO bombing took the lives of 16 civilians in 1999—the ruins remain in the center of Belgrade.

Memorial to the 89 children killed during the NATO bombing of Serbia.

This small bronze pyramid marks the center of Belgrade, but some say it is a Masonic symbol.

Belgrade’s oldest restaurant has a rather unusual name.

Considered an architectural abomination by some, this metal-clad building is known as 'little red riding hood' by locals.

This statue of a 15th-century Hungarian military and political figure has become known for its resemblance to a particular cartoon knight.