The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

A town's history displayed through a massive work of art.

An iconic designer dunny inspired by Aboriginal fishing baskets.

A sparkling sandstone cliffside that's worth a visit while it still exists.

Built on the foundations of an ancient Roman villa, the unique architecture of this castle on the Catalan coast was used as a set for 'Game of Thrones.'

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

The last water-powered beam pumping engine in Britain.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

A small literary museum remembers the life and works of the author of The Thirty-Nine Steps.

An abandoned, desolate train tunnel that was used during World War II.