xxxhackerxxx you seem to have done research and know what you're talking about - does the Versailles increase HP for all troops or just the ones caught within the circle of effect?
Also do you know whether Acropolis effect speeds up troop spawned from Colosseum & Town Center?
1. Versailles: good for buffing cavalry troops with 10% bonus HP, that is all
2. Taj Mahal: decent amount of free trade-goods, will take about a year before it's 2% bonus loot will refund it's cost
3. Temple of Tikal: Trade cap is worse than Taj Mahals free trade-goods, 3% refund will take years to refund it's investment due to peace treaties
4. Ankor Wat: Heal is useless and 1 trade good per day vs the 5-10 saved by Taj Mahal
* Versailles HP bonus includes your raiding barrack troops (it has nothing to do with the radius of its slow effect)
The above information is only based on value of resources spent. Some people may choose wonders on a different merit (I myself prefer wonders to match my nations building style). In reality, only Notre Dame is worth building, and Versailles for Greek / French players or other heavy cavalry players.
--4. Hanging Gardens: Useless past iron age, requires 2 workers to use when they spend days to upgrade something
any something new about the Eiffent, Stautue of Liberty or Square post more man !