Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

The stately remains of Llywelyn the Great's mighty fortress.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

Britain’s highest medieval monastery is a remote ruin nestled at the head of a valley 1,240 feet above the sea.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

You can enjoy a (possibly haunted) stay at the medieval Norman castle that was once a favorite hunting lodge of King John.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A quaint hamlet of nine cottages around a small green near Blaise castle.

Asthmatic Charles Hyett's son built a fantastical garden for his father to convalesce in, alas it was too late.

This stretch of the River Severn where large waves flow against the current is the birthplace of river surfing.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

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

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

A science fiction-inspired apartment building designed by a famous Spanish architect.

An architect transformed this abandoned cement factory into his castle-like workshop.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

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.

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

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

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

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

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

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