The Cave of Mount Uhud (Arabic: غار جبل احد) is a naturally formed cave on the side of Mount Uhud facing Masjid-e-Nabwi. It is where the Prophet (ﷺ) took refuge after being wounded during the Battle of Uhud. He was carried there on the back of Talha (رضي الله عنه).
Close up of the cave:
The view from inside the cave:
References: Wikipedia