The Osirion is a peculiar building alongside the temple of Seti I at Abydos, Suhag, 45 km to the north of Luxor in Egypt. It was discovered in 1902 by Petrie and Murray. The construction was built several meters lower than the temple of Seti I next to it, which suggests earlier construction. The building is unusual because it has a very different style, and is made of enormous granite stones, some weighing more than 100 tons. The surfaces of the stones are ‘polished smooth’ and seem to be made with machined precision. There are no inscriptions on the stone blocks, apart from some crude signs that seem to have been added during later times.

When the temple was discovered, it was completely filled with sand. Today, the foundations of the temple are below the underground water level, which has led to the decay of the stones because of the minerals in the soil. The mysterious architecture, the huge granite blocks, the extremely smooth surfaces and the absence of signs or drawings makes one wonder who built this temple.