This is way cool.

Archaeologists have discovered a new pyramid under the sands of Saqqara, an ancient burial site that has yielded a string of unearthed pyramids in recent years but remains largely unexplored.

The 4,300-year-old monument most likely belonged to the queen mother of the founder of Egypt‘s 6th Dynasty, and was built several hundred years after the famed Great Pyramids of Giza, antiquities chief Zahi Hawass told reporters in announcing the find Tuesday.

The discovery is part of the sprawling necropolis and burial site of the rulers of ancient Memphis, the capital of Egypt‘s Old Kingdom, about 12 miles south of Giza.

Hawass’ team had been excavating at the location for two years, but only determined two months ago that the structure, with sides about 72 feet long, was the base of a pyramid. The pyramid is the 118th discovered so far in Egypt, and the 12th to be found in Saqqara. Most are in ruins; only about a dozen pyramids remain intact across the country.

Hawass said he believes the pyramid belonged to Queen Sesheshet, who is thought to have played a significant role in establishing the 6th Dynasty and uniting two branches of the feuding royal family. Her son, Teti, ruled for about a dozen years until his likely assassination, in a sign of the turbulent times.

The last new pyramid, found here three years ago, is thought to belong to the wife of Teti’s successor, Pepi I.

In June, Hawass’ team unveiled a “rediscovery” at Saqqara — a pyramid believed to have been built by King Menkauhor, an obscure pharaoh whose pyramid was first discovered in 1842 but was later buried in sand.