The New Yorker is well-known for this, and its tradition for using obscure words is long-running. It goes at least as far back as 1969, when "Business Adventur

The New Yorker is well-known for this, and its tradition for using obscure words is long-running. It goes at least as far back as 1969, when "Business Adventures" was written by John Brooks, a long-time New Yorker author. I had to read that book with a dictionary, and used it every couple of pages. I still remember learning the word 'eleemosynary' from it.