That Atlas Obscura link is a godsend!
I've been enjoying what I've read so far of the Nile SB preview and really appreciate the effort to keep the corny fun of pulp adventure while respecting the cultures and complexities of the region. Its a tricky road to take but its worth the care.
Of the places and things that might be fun to explore Nile-style:
Oklo Reactor. A natural nuclear reactor (!?) in Mounana, Gabon. I have no clue about the real science involved, but I can see Mobius having an avid interest in the weird science version.
Battle of Abu Klea Memorial, in Al Matammah, Sudan. Site of a battle between Victorian English soldiers (who had an early machine gun?) and a much larger force of Sudanese fighters who often had only spears to fight with. It lasted only 15 minutes but casualties were terrible, with around 1000 Sudanese killed. Its described as being real spooky in the Atlas Obscura article, and given its Victorian connection it could be interesting to make it haunted by some Orroshan-style horrors.
Dona Beatriz Kimpa Vita is a fascinating figure from the 17th-18th century who claimed to be a prophet who brought Kongolese tradition into the Catholicism brought to the region by Portuguese colonialists. This resulted in a revolt and her attempt to unite the tribes of the region under a single king. She was burned at the stake for heresy at the behest of Portuguese monks but her followers would continue their resistance after her death. Her legacy as an antislavery figure and religious leader could have lent some spiritual power to relics tied to her Antonianism movement.
The Queen of Sheba is a figure of some ambiguity in folklore and history - but given Torg (and esp. the NE's) preference for legend over fact, surely she's got some place in the cosm. Apparently in Ethiopian stories her son with Solomon went on to take possession of the Ark of the Covenant and brought it to Aksum, the presumptive seat of her realm. The ruins there are of course a good spot to have some demi-mystical hi-jinks, and they include quite a few stelae.
And, since we're all about cinematic references, some more deets on Casablanca as a refuge for the diaspora of the Possibility War(s) could be fun. I can definitely see a lot of cross-realm intrigue going down there, with agents from the Cyberpapacy, Pan-Pacifica, African Alliance, Delphi Council, and who knows what else getting into spy games. The romance of the place and its proximity to the Mediterranean make it an ideal place for a base of operations or crux of an adventure.
EDIT: Oh, btw, I kinda liked the Martian nonsense in oTorg's Terra. I included a visit from one as a bit of surprise twist at the end of an adventure I ran, but I can understand if you want to avoid bringing in intergalactic weirdness at this stage of the game.