I'm surprised nobody has mentioned The Mausoleum of Maussollos. (Whosit did, but he doesn't have Calendar yet I think).
I seem to recall that it was singled out as an important wonder by Spullla early on, but they never mentioned it after actually discovering Calendar.
I seem to recall that it was singled out as an important wonder by Spullla early on, but they never mentioned it after actually discovering Calendar.