The Anasazi civilization also had an early complex development of room structures, probably the oldest in North America, while the  Maya of Central America had very advanced room configurations as early as several hundred AD. By at least the early Han Dynasty in China (e.g. approximately 200 BC), comfort room complex multi-level building forms emerged, particularly for religious and public purposes; these designs featured many roomed structures and included vertical connections of rooms.
The Anasazi people's early development of room structures in North America was matched by the advanced room configurations of the Maya civilization in Central America. Meanwhile, in China, the comfort room complex multi-level building designs that emerged during the Han Dynasty (around 200 BC) featured many rooms and vertical connections for religious and public purposes.