Peştera cu Oase, Romania

Discovered by: Ştefan Milota, Ricardo Rodrigo, Oana Moldovan and João Zilhão

Age: About 41,500–39,500 years old

Species: Homo sapiens

Oase 2 is a modern human but retains a few archaic traits, such as wide cheek bones. Some scientists wonder if this means that on rare occasions Homo sapiens interbred with Neanderthals, who lived in Europe at the same time.