Sumer
Sumer () is the earliest known civilization in the historical region of southern Mesopotamia, modern-day southern Iraq, during the Chalcolithic and Early Bronze ages, and one of the first civilizations in the world along with Ancient Egypt and the Indus Valley. Living along the valleys of the Tigris and Euphrates, Sumerian farmers were able to grow an abundance of grain and other crops, the surplus of which enabled them to settle in one place. Prehistoric proto-writing dates back before 3000 BC. The earliest texts, from c. 3300 BC, come from the cities of Uruk and Jemdet Nasr; early cuneiform script emerged around 3000 BC.
Architecture of Taiwan
Prehistoric man made use of caves for their dwellings and Taiwan's oldest known civilization is the Changbin culture (長濱文化) dating back to over 50,000 years. An example of an archaeological site of a cave dwelling is the Bashian Caves in Changbin Township, Taitung County which is dated from between 5,500 and 30,000 years. The actual cave itself has a height of around ten meters and can accommodate some ten persons.