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

This small museum tucked within a subway station holds pieces from Madrid's past.

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.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

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.

From grand battles to daily life, this Spanish museum offers a view of world history in miniature.

This cemetery features modernist statues as strange as its name.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Read a book with a glass of wine at this classically restored bar.

An open-air "garden" of mural art that changes weekly.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This Funeral Hearse Museum represents the finest in cadaver transportation.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

An extraordinary mechanical calculator designed by the mathematician and philosopher Gottfried Leibniz.