The Gaia Temples are buildings that appear in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. They are seven ancient temples that can put Sonic's World back together when it is shattered by Dark Gaia.
The Gaia Temples are said to have some sort of connection to the Chaos Emeralds, somehow tying into their power. When the Chaos Emeralds are gathered and placed in the seven Gaia Temples, they will restore Sonic's world when the planet is shattered during an event that occurs every ten thousandth year.
At some point, a Gaia Temple in Efrika became a base of the Efrika Egg Army. During the Shattered World Crisis, where Dr. Eggman wanted to control how the planet was going to be restored, he ordered the Efrika Egg Army to heavily defend their Gaia Temple.