Stunning Roman aqueduct used for 1900 years and still standing.

The grotto where Saint Ignatius of Loyola lived as a hermit for nearly a year.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

The Gaudí-inspired building that was the start of Terrassenc modernism.

The unexpectedly beloved remnants of a controversial thermal power plant.

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

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

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

This colorful statue welcomes visitors to a Barcelona park.

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

A beautiful but toxic fountain of mercury.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

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

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

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

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

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

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

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.

Turntable anonymously received orphans, alms, and groceries.

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

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

Tucked away in Seward Park is Seattle’s only old-growth forest.