UMs: Lost Artifacts/Civilizations part 3

Right off the heels of a lost treasure post, we come back to the lost artifacts and civilizations again. So, you just get some background vibes going and read on:

We call them the Minoans. However, their language has never been deciphered to the point we don't even know what they called themselves. Who were these ancient advanced seafaring people during the Bronze Age in Crete?
https://www.reddit.com/r/UnresolvedMysteries/comments/jrcyo1/the_minoans_were_an_ancient_seafaring/

The African Kingdom of Aksum/Axum was one of the most powerful kingdoms of it's time, but no one knows why they went into decline and disappeared:
https://www.reddit.com/r/UnresolvedMysteries/comments/m1xi9p/for_a_time_the_african_kingdom_of_aksum_was/

Ancient bronze Dodecahedrons from more than 1500 years ago are discovered relatively often, but we still don't know what they were used for:
https://www.reddit.com/r/UnresolvedMysteries/comments/d5ji8m/the_mysterious_bronze_objects_that_have_baffled/

A 2,000-year-old vessel off a Greek island contains what people think was a rudimentary computer, but how does it work and what does it do?
https://www.reddit.com/r/UnresolvedMysteries/comments/e47k8h/the_2000_year_old_computer_how_did_the_missing/

Kind of a different one, here. An archaeologist lost in the Yucatan Jungle discovers someone claiming to be a 1000 year old blind Mayan priest guides him to safety:
https://www.reddit.com/r/UnresolvedMysteries/comments/4y7zod/in_1931_a_renowned_archaeologist_found_himself/