This mansion oasis contains gardens, sculptures, and fountains just off the busy Plaça Kennedy in Sant Gervasi.

The unexpectedly beloved remnants of a controversial thermal power plant.

Barcelona's only remaining tram system takes riders to the Tibidabo funicular.

The oldest still-operating tavern in the United States was once owned by a pirate.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

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

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

These 2000 year old remains of a Roman aqueduct are hidden inside a hotel lobby.

An early 20th-century bullring converted into a modern shopping center.

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

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

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

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

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

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

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

This colorful statue welcomes visitors to a Barcelona park.

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

Barça football fans might see the insignia hidden in a church window as a divine sign.

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

Love is in the air along the small street in Brooklyn.

The Underground Railroad passed right through this historic Brooklyn Heights church.

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