Lepsius I pyramid

 pyramid, tomb(s), place with historical importance, ancient civilization, ancient ruins

This is a mudbrick structure built in the easternmost hills promontory. This structure was originally discovered by J. Perring in the 1830s, and was also investigated by Vyse, who luckily didn't blow it up. Later, Bisson de la Roque also briefly examined the structure, but the most recent and comprehensive work appears to have been completed by Nabil Swelim, an Egyptian archaeologist, in the mid 1980s.
There seems to remain some debate about whether this is indeed a pyramid, and if so, who built it. Verner doesn't seem altogether sure that it even is a pyramid, and while Lehner refers to the structure as a pyramid, he seems to believe it was possibly a provincial step pyramid, such as others scattered as for south as Elephantine. Provincial pyramids are most often small, step pyramid that in general are believed to have not been built as tombs.