#Roman fortress
- Abrittus — An ancient Roman city and major fortress in the province of Moesia Inferior, located near the modern town of Razgrad in northeastern Bulgaria; famous in history as the site of the Battle of Abrittus in 251 AD, where the Roman Emperor Decius and his son Herennius Etruscus were defeated and killed by the Goths led by King Cniva.
- Apulum — The largest urban, political, and military center in Roman Dacia, developed on the site of modern-day Alba Iulia; the settlement was initially a castrum built by the 13th Legion Gemina, structurally evolving into two distinct cities (Municipium Apulense and Colonia Aurelia Apulensis) and becoming the residence of the governor of Dacia Apulensis province.