Hellenistic Architecture refers to the architectural style that emerged after the death of Alexander the Great in 323 BCE and lasted until the Roman conquest of the Greek world. This period is characterized by grand structures, elaborate designs, and the incorporation of various cultural influences due to the spread of Greek culture across the Mediterranean and Near East. Key features of Hellenistic architecture include the use of monumental buildings, intricate sculptures, and the development of new construction techniques. Notable examples include the Great Altar of Pergamon and the Temple of Apollo at Didyma, which showcase the era's emphasis on dramatic scale and detailed ornamentation.