im researching ile ife right now found some interesting stuff on how they paved all the roads there and the process of how they did it. real cool stuff Movements, Borders, and Identities in Africa
also looking at some work their doing on Ile ife's famous Eredo wall. http://www.ifra-nigeria.org/IMG/pdf/preliminary-report-ife-sungbo.pdf
basically Ile Ife is a advanced mega city burried under hundreds of years of vegetation and soil.
heres some ife bronze work. Igbos bronze work actually predates most of the ones they found in Ile Ife so far. Yoruba | (Ife Kingdom Figures)
This is pretty neat!
Also I heard Ile Ife had plants from the Americas, but thats a topic for another time.