1. Early architectures included megalithic structures like menhirs, dolmens, and cromlechs made from large stone blocks. One of the most famous is Stonehenge, built around 2500 BC in England.
2. Egyptian architecture developed around 4000 BC, featuring thick stone walls with hieroglyphic carvings and temples aligned with astronomical events. Notable structures include the Great Pyramids of Giza and mastaba tombs.
3. Greek and Roman architectures flourished in the classical period, with Greek temples built in columns orders and the Romans constructing massive public buildings and infrastructure projects like the Colosseum.