Mirror Towers are large towers made of steel. They have ring shaped areas at the top that glow when harnessing solar energy.
Features and traits
Mirror Towers' sole purpose and function is gathering solar energy from the sun, which it then transfers over to Sunshine Balls in order to provide heat and light for people.
Egg Moon Saga
The Mirror Towers were set up by Eggman with the aid of the Guardian Units of the Nations in order to harness sunlight. However, Sonic would go on to take out many Mirror Towers before finally revealing the truth of Eggman's scheme. With the Egg Moon no longer blocking the sun, all the Mirror Towers were presumably taken down.