The largest ancient castle complex in the world, with St Vitus Cathedral, the Golden Lane cottages and the hourly guard change.
Cliff-carved tunnel fortifications.
The Prince of Liechtenstein’s home on a crag above the capital — closed inside, but the hillside path gives the postcard view.
Fortress park above the meeting of the Sava and the Danube.
Cafe-lined riverside old town.
Fairytale medieval walled city, UNESCO-listed.
Ottoman-era citadel quarter stacked above the bay of Algiers.
Manila’s walled Spanish city: Fort Santiago, the San Agustin Church and horse-drawn kalesa rides along the ramparts.
Fortress on Castle Rock holding the Scottish crown jewels and the one o’clock gun.
Sea fortress islands off Helsinki, UNESCO-listed.
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