here are ruins of a number of temples, including the chief temple dedicated to Amun, and a very important royal necropolis of the Third Intermediate Period (which contains the only known intact royal Pharaonic burials — the tomb of Tutankhamun having been entered in antiquity). Many of the stones used to build the various temples at Tanis came from the old Ramesside town of Qantir (ancient Pi-Ramesses/Per-Ramesses), which caused many former generations of Egyptologists to believe that Tanis was, in fact, Per-Ramesses. However the burials of three Dynasty 21 and Dynasty 22 pharaohs — Psusennes I, Amenemope and Shoshenq II, survived the depredations of tomb robbers throughout antiquity. They were discovered intact in 1939 and 1940 by Pierre Montet and proved to contain a large catalogue of gold, jewelry, lapis lazuli and other precious stones including the funerary masks of these kings.
The chief deities of Tanis were Amun, his consort, Mut, and their child Khonsu, forming the Tanite triad. This triad was, however, identical to that of Thebes, leading many scholars to speak of Tanis as the "northern Thebes".
In 2009, the Egyptian Culture Ministry reported archaeologists had discovered the site of a sacred lake in a temple to the goddess Mut at the San al-Hagar archaeological site in ancient Tanis. The lake, built out of limestone blocks, had been 15 meters long and 12 meters wide. It was discovered 12 meters below ground in good condition. This was the second sacred lake found at Tanis. The first lake at the site had been identified in 1928.