It is very hot in Matmâta, Tunisia. Traditionally homes are
made by digging a large pit, about 7m (23ft) deep and 10m (33ft) wide, and then
around the sides of the pit tunnelling in a few meters before
cutting caves. The homes are grouped around a central courtyard
and connected to other courtyards with more rooms forming an
underground maze. You can read more about these
cave homes here.