According to the Poseidon Adventure Editor manual, it is not possible to build pyramids in Greek cities. If there is a work-around, I do not know of it.
I also like building pyramids, but I prefer the Pan-Helenic games to just science. Getting Trophies for your city's victories and hosting the Olympics!
From Appendix 7 Available in Atlantean Adventures Only
Science buildings (Bibliotheke, Inventors’ Workshop, Laboratory, University, Observatory and Museum)
Frigates and Frigate Wharves
Towers that launch Atlantean Fire
Citadel of Poseidon
Bridges made of stone
Charioteers Available in Greek Adventures Only
Culture buildings (Gymnasium, Drama School, Theater, College, Podium and Stadium)
Promontory of Poseidon
Triremes and Trireme Wharves
I prefer the Greek aesthetic over the Atlantean one, but I really enjoy building pyramids. Is there any way to add pyramids to Greek cities? Messing around with the adventure editor, I've learned that Greek cities can't build Refineries or Black Marble Quarries, but they can receive Orichalc and Black Marble from external sources (imports, gifts, plunder, etc). Unfortunately, it seems that if you enable pyramids, they just won't show up for Greek cities. Anyone know if there's a work around for this?