10 US Archaeological Discoveries Shrouded In Mystery
An aside: I enjoy how "pre-programmed" contemporary scholars are about climate change, as they now seem to apply it as the convenient explanation for any "lost city" that is discovered. Speaking as one who studied the Maya, the classic civilization of lost cities, rather than the rather vague notion of climate change, it is more likely that it was economical change that cause ancient cities to lose their communal value and be abandoned by the population. Consider Detroit, for example. While this can be climate related, often it was the product of the human factor.
Also, usually the least exotic theory is the most likely.