I read The New York Public Library's web site, which has a list of 100 Picture Books Everyone Should Know. I went to the site to see if I agreed with their selection, and I did.
There are a few titles I might delete so I could add a personal favorite, but it is a good list. Everyone should know these books, experience them read aloud, and the best place to find them is at your public library.
A few of my favorites that made the list:
Bark, George by Jules Peiffer
Don't Let the Pigeon Drive the Bus! by Mo Willems
Martha Speaks by Susan Meddaugh
Miss Nelson is Missing! by Harry Allard