Mystic Ruins (Sonic X)

The Mystic Ruins is a location in the Sonic X anime. Originally existing in Sonic's world Mobius, the Mystic Ruins, for a brief period of time, was relocated to Earth thanks to the effects of Chaos Control.

Past
In the past, the Knuckles Clan lived and thrived in this location, calling it their home. However, when the majority of them were wiped out by Chaos, the area was gradually abandoned, eventually being overgrown by the nearby plant life.

Chaos Saga
After being teleported to Earth, the Mystic Ruins was visited numerous times. It was where Eggman first learned of the existence of Chaos and where Sonic learned of Chaos' ability to transform into Perfect Chaos, both having learned through the stone tablets that had been left behind by the echidnas.

Sonic and Knuckles were also shown visions by Tikal and the Master Emerlad's shards of the happenings of the past, and what exactly led to Chaos' anger and the destruction of the Knuckles Clan, all of which took place in the Mystic Ruins of the past.

Being the hiding place of the Final Egg, Sonic also briefly visited this locale when giving chase to Eggman from the Egg Carrier.