The Eastgate Centre in Harare, Zimbabwe may look just like any other tall buildings around the world, but it is quite different: it was modeled after termite mound!
The Eastgate Centre in Harare, Zimbabwe, typifies the best of green architecture and ecologically sensitive adaptation. The country’s largest office and shopping complex is an architectural marvel in its use of biomimicry principles. The mid-rise building, designed by architect Mick Pearce in conjunction with engineers at Arup Associates, has no conventional air-conditioning or heating, yet stays regulated year round with dramatically less energy consumption using design methods inspired by indigenous Zimbabwean masonry and the self-cooling mounds of African termites!
Inhabitat blog explains how this building stays cool year round without AC: Link