Walrock Homebrew: Worldbuilding Option: Fortresses, Temples

The World's 30 Most Impressive Fortresses

Fortresses, Temples and Strongholds

Strongholds of the Samurai: Japanese Castles 250-1877 (General Military)

The Blacksand Bastion - desert stronghold - Paths Peculiar

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 of Yamabe: The Castles That Came and Went

Twelve More Forts and Castles from Around the World

Antonia: The Fortress Jerusalem Forgot – Popular Archeology

Walrock Homebrew: Worldbuilding Option: Fortresses, Temples, & Strongholds [Fourth Draft]

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