ok, to expand my idea somewhat.
Basic religion groupings, with their wonders
Animist
Stonehenge
Hagar Qim (in Malta)
Uluru (aka Ayer's Rock. Not technically built, but the myths surrounding it had to be 'built')
Polytheist
Norse:
Horn of Valhalla
The Bifrost Bridge
(These are a bit mythological, but I can't think of anything else)
Graeco-Roman:
Temple of Zeus
Temple of Artemis
The Oracle
Meso-American:
Chichen Itza
(others? What was in that conquests scenario?)
Egyptian:
The Pyramids
The Sphinx
Babylonian:
Epic of Gilgamesh
Monotheist
Due to the intertwined nature of the three major monotheistic faiths, some of these wonders can be built by more than one of these groups. Muslim, Protestant, and Jewish wonders seem to be lacking. I can't think of any more.
Dome of the Rock (compatible with all monotheistic groups)
Hagia Sophia (Orthodox, Muslim)
The Ark of the Covenant (Catholic, Orthodox, Judaism)
Church of the Holy Sepulchre (Catholic, Orthodox)
The Knights Templar (any Christian)
JS Bach's Cathedral (any Christian)
The Holy Grail (any Christian)
Catholic: (7 wonders)
The Sistine Chapel (nb this is a part of the Vatican; the Vatican probably shouldn't be a separate wonder)
Orthodox: (8 wonders)
St Basil's Cathedral
Protestant: (5 wonders)
The Gutenburg Bible
Muslim: (6 wonders)
The Qa'aba
Qutab Minar (Delhi)
Travels of Ibn Battuta (immediately get territory map off every civ on same continent, and establishes contact with them)
Jihad (a relatively modern one, produces some kind of unit)
Judaism: (5 wonders)
The Wailing Wall
The Dead Sea Scrolls
The Temple of Solomon
Dharmic
(This includes Hinduism, Buddhism, and Shinto (in its merged form with Buddhism). The defining characteristic is a belief in reincarnation.
Hindu:
The Ramayana
The Mahabharata
Somnath Temple
Angkor Wat
The Taj Mahal
Buddhist:
Potala Palace
Stupa of the Wild Goose
Mogao Caves
Pagan Pagodas
Shintoist:
(various major shrines from throughout Japan can be used here)
Secularist
Theory of Evolution (as a direct denial of a theist-origin, this belongs here)
Perhaps most of the modern science wonders could be placed here, to give a decent incentive to go secularist?
I haven't yet contemplated what effect any of these wonders should have. This list is neither exhaustive nor necessarily a list of those that must be included.
To restate the basic rules on religion in this model:
- You start with Animism as your religion.
- Each time you research a religion tech (Polytheism, Monotheism, Dharma, Secularism), you get a one-time option to change to that religion. Note that this means you can never go back. It also means that if you decide not to change now, you can never change to that religion group.
- Changing religion automatically makes all your religious wonders obsolete. (optional) They do continue to generate culture.
- You can only build wonders that are compatible with your current religion.
- Changing religion should result in lots of civil disorder for a few turns.