This historic Art Nouveau townhouse was the former home of the son of a famous chemical inventor and industrialist.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

A 16th-century Andalusian palace.

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

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

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

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

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Get buzzed beholding one of the world's largest coffee-machine collections, then step into the café for a specially brewed cup.