Monastery and necropolis - probably not the best if you get nightmares watching cryptkeeper movies because there are mummified bodies on display everywhere.
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مسجد العارف بالله.
The el-'Arif Mosque was built in the 14th century, has paired minarets and an ornamentally painted ceiling.
A busy church, busy in the sense of ornamentation, paintings all over the walls and an iconostasis.
جامع الفرشوطي
Another mosque that you might as well see since you're in the neighborhood that has a minaret reaching 53-metres.
الدير الأبيض
This is probably what Sohag is most known for, the Coptic monastery that has long been inhabited by monks. It is dedicated to Shenouda the Archimandrite and was established in or around 442 AD. Living history.
الدير الأحمر
This is another monastery down the valley a little, stemming from the 4th century AD. This one also Coptic in nature and named after an Egyptian saint christened Pishay. The main nave feels pretty cavernous.