Even though, originally, this mosque was the first one built in Egypt, due to the building being continuously rebuild and restored, there is not much left since its origin in the 7th century. Still, the mosque is worth visiting for its marvellous courtyard and historical atmosphere that will encompass you.
Wikipedia https://en.wikipedia.org/wiki/Amr_ibn_al-As_Mosque
Address Cairo, Egypt
Coordinates 30°0'36.337" N 31°13'59.217" E