A temple to modernity, tucked away amid Barcelona's more well known museums.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

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

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

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

A beautiful but toxic fountain of mercury.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

Known as the Casa de las Siete Chimeneas, this haunted 16th-century manor has a dark, mysterious past.

One of the best examples of the modernist movement in Madrid.

Nicknamed the "Spirit of Paul Klee," this colorful apartment building features an array of multicolored panels.

This 18th-century project to build the world's tallest gravity dam was never completed.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

Strange masks and obscure costumes are housed in this old Madrid corrala.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.