I'm unsure so I think I'll do both, Ziggurat and Ishtar Gate
Spoiler :
Ziggurat
Ishtar Gate
- Replaces Temple
- Cost: 200
- Maintenance: 2
- +1
Faith
- +1
Science
- +1
Culture
- +1
Food
Ishtar Gate
- Unique National Wonder
- Must have built Walls of Babylon in all Cities
- Can only be built at the
Capital
- Upon finishing provides 100
and 100
Culture
- +1
Tourism and +1
Food for every
International Trade Route with the
Capital