A user named SantaBaby posted a message here on the Tain concerning huge map collections for Bungie's Myth and Marathon series which are now available on the Wayback Machine/Internet Archive.

World’s Ultimate Myth Maps Collection […]
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World’s Ultimate Myth Maps Collection

Post by SantaBaby » Mon May 22, 2023 1:55 am
Hello! An old friend of mine has posted what appears to be the biggest archive of Myth and Marathon files in one place, on The Internet Archive.

The Myth archives:
https://archive.org/details/UltimateMythMaps

The Marathon archives:
https://archive.org/details/UltimateMarathonMaps

I think these will keep you very busy. 🤣 Thank you!