Acra (fortress) - Wikipedia

Fortresses, Temples and Strongholds

Walkthrough:The Three Forts, Stronghold Wiki

10 Of The Most Impressive Crusader Castles

The Fortress of Königstein

The ancient rock fortress of Yapahuwa is similar to, but smaller than, Sigiriya. Dating from the 13th century, it was the capital and main stronghold of King Bhuvanekabahu I (1272 - 1284)

Strongholds & Followers : Complete Temple Map Bundle — Jared Blando

Twelve More Forts and Castles from Around the World

Strongholds Parts in D&D 5e

Along Hadrian's Wall, ancient Rome's temples, towers, and cults come to life

The Twelve Castles / The Twelve Temples, Quest Master