Planet of the Milky Way that you do not know the name. on it is a stargate and a Goa'uld pyramid around which grew a large city by using the crystals to the tunnels, modified for the occasion. Inside the pyramid there is a 'puller symbionts. The planet also is heavily guarded by numerous Ha'tak acquired after the fall of the Goa'uld.
The location of this planet as well as his name remains a mystery, but the presence of a stepped pyramid indicates that the planet was once within the space Goa'uld.