There is always some work going on in the limestone mountains near Luxor

Many times in the past, archaeologists have believed that all the excavation work has happened in the Valley of the Kings, and there are no further tombs that are to be found. However, everytime this has been thought of, there have been more tombs that have been found. As a result, there is always some amount of work happening in the area (it is possible that some tombs are not found because their entrances have been lost due to landslides or floods).
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