Archaeologists have discovered the remains of a 44,000 year old Neanderthal building that was constructed using the bones from mammoths.
The circular building, which was up to 26 feet across at its widest point, is believed to be earliest example of domestic dwelling built from bone.
Neanderthals, which died out around 30,000 years ago, were initially thought to have been relatively primitive nomads that lived in natural caves for shelter.
IIRC, these aren’t unknown but were later and/or not generally related to Neanders. Actually, I’m thinking this is probably the first structure actually linked to Neanderthals, yes? Caves and rock shelters they occupied regularly, but actual constructions, I did not think so.