BlackMageJawa: you are so right, I love them too and Myst was not the first 1st-Person game.
Btw, I'm lucky enough for having the later cdrom re-releases of:
1- Cosmic Osmo & the Worlds Beyond the Mackerel [Macintosh] [CD Version] - Broderbund Software - 1993
2- Spelunx and the Caves of Mr. Suedo [Macintosh] [CD Version] - Broderbund Software - 1993
Too bad they are not for PC.