ok, guys,
the rule changed to
-3 , +1
corrected list:
Chichen Itza (19)
Eiffel Tower (11)
Notre Dame (13) (-2 Kevin j ), -1 correct
Statute of Liberty (1) ( -2 blue oyster ), -1 correct
Great Library (21)
Hagia Sophia (32)
Hanging Gardens (13)
Oracle (8)
I hope this is now correct ..
My vote :
Chichen Itza (19)
Eiffel Tower (8) -3
Notre Dame (13)
Statute of Liberty (2) +1
Great Library (21)
Hagia Sophia (32)
Hanging Gardens (13)
Oracle (8)
SoL - enourmous production increase
ET - Happiness is very important, but ET comes late and has relative low happiness increase compared to ND. And there are more options to increase happiness at the age of ET, than at the ND-age.
to GL, besides +3 science, a free tech, it also offers a free library. And the important slingshot for Civil Service.