These rose marble urinals are the most luxurious loos in Liverpool.

This ancient castle has been abandoned since the Edwardian conquest of Wales.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

The Dead Sea Scrolls were discovered in the ruins of this ancient monastic community.

A "miracle" that seems to produce more holy fistfights than holy revelations.

The sunlight passing through the opening of this huge cave system creates a magical effect.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Five candy-colored villages on the Italian Riviera.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

A lakeside footbridge that records Nobel Prize laureates' names in metal silhouette.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

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

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

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

For one day every month Barcelona's Estació de França transforms into a market for model trains.

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

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

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

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

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

This ancient Spanish castle sits high upon a hilltop.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.