"Pyramid" in the context of ancient architecture primarily refers to the Egyptian pyramids (see List of Egyptian pyramids). Various other structures built in antiquity have also been called pyramids:
Mesoamerican step pyramids, see Mesoamerican pyramids
Chinese pyramids
Mesopotamian Ziggurats
The Nubian pyramids, Sudan
The Pyramid of Hellinikon, Greece
The Pyramid of Gaius Cestius, Porta San Paolo, Rome
The Star Pyramid or Pulemelei Mound, Samoa