Site of Banu Quraizah

Bani Quraizah were a Jewish tribe who rebelled and betrayed their peace treaty with the Muslims during the Battle of the Trench. The Muslims laid siege to the tribe, this spot (where a masjid once stood) marks the place where the prophet (s.a.w.) offered salah during the siege.

(more to follow)

References:
Wikipedia
History of Madinah Munawwarah – Dr. Muhammad Ilyas Abdul Ghani