Oldest Forts in India

Ancient Greek Fortress Unearthed Near Jerusalem

DnD 5e Homebrew — Fortresses, Strongholds and Temples for Players

Creating Strongholds for Your DND Character: Castle to Kingdom Strategies

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)

Chitradurga Fort – Chitradurga, India - Atlas Obscura

Jiayuguan Fortress – Jiayuguan, China - Atlas Obscura

6 Most Famous Forts Of Rajasthan

Review – Strongholds & Followers – The Kind GM

Paths to Adventure: Castles and Strongholds

WH} Fortresses, Temples, & Strongholds, rules for building and customizing player-owned structures! - Dungeon Masters Guild