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.

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

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

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

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

The morbid items in this small and hidden museum are not for the weak stomached.

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

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

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

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

A bookstore dedicated to the intersection of comedy and art.

This fountain was designed to honor the man who helped bring water to Barcelona.

On the wall of this medieval square, a symbol of the Spanish Inquisition.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

Week-long block party becomes a competition for the best decorated street.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.