Actually, there are two: One is supposed to be between the Aeneid (Giant Epic Poem) and the Hobbit...based on 10000 BC cultures, early tools, and Ice Age animals.
Other one is set in the semi-future, where red tape has stopped actual scientific progress, government is deadlocked into dystopia, and the last of the "innovative millionaires" are trying to fix the world in their own image. Meanwhile, a group of consultative idealist/artist/self-sufficient 20-30 year olds attempt to help people...