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

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

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

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

An ancient Egyptian temple in the middle of Madrid, Spain.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

The best place for scenic views of the DMZ and North Korea.

A monument to the two U.S. officers killed by North Korean troops while trying to trim a poplar tree.

South Korea's largely symbolic, barely used gateway to the North.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

Secret North Korean passage discovered below the world's most dangerous border.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

The house that took a plunge into the facade of a museum.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

Follow the original medieval paths that wind through this intriguing section of the city.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A Spanish town built into the cliffs.

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