Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

The only castle in North America to ever house European sovereigns.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

Reminders of the Battle of Berlin still scar the railway.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

This fountain pays homage to Qatar's history of pearling, the primary industry before oil.

A superb spot to appreciate the traditional boats of the Indian Ocean.

Qatar's oldest market can trace its origins back more than a century.

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

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

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

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

This local art collective supports contemporary artists through a coveted residency program.

The farmhouse owned by the Danish author who wrote "Out of Africa" is now a museum honoring her legacy.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This working class sculpture pounds his hammer all the livelong day.

From a neon Rapunzel to a bike traffic meter to a street fair color scheme, the most opened drawbridge in the US is a veritable art gallery.

This former coal gasification plant found a curious second life as a popular public park.

A museum dedicated to the history and exploration of both popular music and science fiction.

A giant Troll lurks under one of Seattle's oldest bridges.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Strange red rock formations that have been attributed to a higher power for hundreds of years.