The Stargate on the planet Abydos was located inside the Temple of Ra also known as Abydos Pyramid, which was entered through the nearby Grand Entrance, a five-story structure. Ra's ship landed on the pyramid when it came to the planet, for the last time, in 1995. (Stargate)
It is unknown whether there were other pyramids on the planet. This pyramid was destroyed along with the surface of Abydos when Anubis fired on it with his superweapon. (SG1: "Full Circle")
Features
The pyramid possessed a secret chamber that stored Ra's treasures. Among them was the Lost City tablet and the Eye of Ra.