Castles

Castles this atlas records under Fortifications and Military Architecture: the largest group in this subcategory by a wide margin, spanning medieval European strongholds, colonial-era fortified residences and comparable castle structures worldwide. Belongs here: any building this subcategory's own description names as a castle. Does not belong here: a citadel or city-wall fortification system, gathered under this subcategory's own Citadels and City Walls group instead, or a fort not itself called a castle, gathered under Forts and Coastal Defenses.