Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

An unsettling shrine dedicated to the ravenous beast that prowled 18th-century France.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

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

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

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

There has been an astronomical clock on this spot since the 14th century.

Hundreds of hidden passageways weave through the old quarters of Lyon.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.