Does Wikipedia have anything to say about Mysteries of the Nile? The National Geographic video production? No. On the other hand, there is a totally different video production named Mystery of the Nile. And there are some pretty interesting things about obelisks. Particularly interesting is the unfinished obelisk, which shows key details on the construction process and methodologies of obelisks. It was abandoned because it had cracks develop in it.
20190828/https://en.wikipedia.org/wiki/Mystery_of_the_Nile
20190828/https://en.wikipedia.org/wiki/Obelisk
20190828/https://en.wikipedia.org/wiki/Unfinished_obelisk