Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

A pair of gigantic baby heads greet passengers at Atocha Station.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Kingly French toast comes soaked in milk or red wine, then drizzled in a citrus-perfumed syrup.

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

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

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

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

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

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

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

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

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

An early 20th-century school building whose clock tower and carved symbols quietly tell the story of the trades once taught inside.

This Kyoto Starbucks takes coffee drinkers back in time.

A beautiful bamboo trail tucked in this famous Japanese shrine.

The 10,000 Torii shrine.