Historical clue formulations

• You might come to one suddenly — 2022-04-10
• Unlikely place to find bars — 2020-06-20
• 56-Down, literally? — 2017-08-27
• Where cells don't work — 2009-09-25
• Where cell phones don't work — 2007-07-20
• Place not much heard from — 2004-09-17
• Place of poor radio reception — 2001-07-27