The buildings of the first breeds are lost, but the fifth civilization was the one, which built the large triangular constructions we call "Egyptian Pyramids” today around 75,000 years ago (Egyptians just found that large ancient pyramids in the sand and tried not very successful to built similar constructions) and the sixth civilization was the one, which built the cities which ruins you can find today beneath the sea in the so-called Bimini Area around 16,000 years ago.
The remains of the first race have disappeared, but there is one building from the fifth civilization.