As far as barbs go, I am fairly certain that I saw barbs build a wonder once. It was in one of my first few games
The Maya, Incas, Aztecs, Olmecs all were very successful civilizations that lived in the jungles of the Americas. There were and still are tribes that live in the Amazon - though they dont attain 'civilization' status of the other civs in this game.
Swamps do exist quite far from oceans. I live 500 miles from the Gulf of Mexico. I have a small swampy area 500 feet from my front yard. Behind my place of employment, there is a couple of square miles of unusable swampland. All you need for a swamp is relatively flat land that doesn't drain real well.
The Maya, Incas, Aztecs, Olmecs all were very successful civilizations that lived in the jungles of the Americas. There were and still are tribes that live in the Amazon - though they dont attain 'civilization' status of the other civs in this game.
Swamps do exist quite far from oceans. I live 500 miles from the Gulf of Mexico. I have a small swampy area 500 feet from my front yard. Behind my place of employment, there is a couple of square miles of unusable swampland. All you need for a swamp is relatively flat land that doesn't drain real well.
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