Historical clue formulations

• Hangout for Dorian Gray — 2020-08-22
• Smoke-filled establishment — 2015-06-28
• Old-time drug hangout — 2014-07-29
• *Setting in Sherlock Holmes's "The Man with the Twisted Lip" — 2008-01-31
• High spot? — 1996-03-03
• Site of Eastern iniquity — 1994-09-30