What are some good modules from the earlier days of D&D to use for new DMs?

@ChrisPerkinsDnD what are some good modules from the earlier days of D&D to use for new DMs and PCs that can be converted to 5e???

— Ryan Urban (@Urbanizer2) September 21, 2016

Putting aside the 100s of modules in Dungeon magazine, I recommend U1, The Sinister Secret of Saltmarsh. #WOTCstaff https://t.co/yKUhu5xCW4

— (((Chris Perkins))) (@ChrisPerkinsDnD) September 21, 2016