Historical clue formulations

• Places of rest — 2021-07-17
• Catacombs — 2019-10-11
• Some vaults — 2017-01-22
• Burial vaults — 2014-12-15
• Underground tombs — 2014-10-20
• Secret places — 2011-03-05
• Locations of some secret meetings — 2009-04-16
• Secret meeting places — 2002-06-02
• Horror movie locales — 1994-11-08