3rd century in architecture

Buildings

 * 209 – Ghal'eh Dokhtar castle built in Persia by future Sassanid Emperor Ardashir I.
 * 216 – Baths of Caracalla, Rome, completed.
 * 224 – Palace of Ardashir built near Ghal'eh Dokhtar by Ardashir I.
 * 266 – Bishapur city founded by Emperor Shapur I as a capital for the Sassanid Empire
 * 290s – Diocletian's Palace, Split, completed.
 * 298–299 – Arch of Galerius in Thessaloniki (Macedonia) built.