Amsterdam's former hotspot for public executions and dissections.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The attic of a four-century-old canal house hides a clandestine church.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

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.

This embalmed man is one of the best preserved mummies from the Canary Islands.

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

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

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

This lucky bronze frog was gifted to Madrid by a casino.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

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.

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.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

The library's graceful rotunda is like a bibliophile's temple.

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