Visit the Casbah of Algiers

The largest ancient castle complex in the world, with St Vitus Cathedral, the Golden Lane cottages and the hourly guard change.

Ancient fortified towns of the Mzab.

Moorish palace-fortress of Granada.

Renaissance sea fortress at Helsingor — the Elsinore of Shakespeare’s Hamlet.

One of Europe’s largest castle ruins, sprawled across a travertine hill.

16th-century castle, UNESCO-listed.

Renaissance Radziwill palace and park.

Manila’s walled Spanish city: Fort Santiago, the San Agustin Church and horse-drawn kalesa rides along the ramparts.