Historical clue formulations

• ___ Picchu — 2024-09-08
• ___ Picchu (ancient Inca citadel) — 2023-08-15
• ___ Picchu, Peru — 2022-03-08
• South America's ___ Picchu — 2018-05-06
• ___ Picchu — 2017-05-28
• ___ Picchu, site of ancient Inca ruins — 2016-10-25
• ___ Picchu (Peruvian high spot) — 2014-12-07
• ___ Picchu (Incan site) — 2013-09-16
• ___ Picchu (Inca site) — 2011-11-02
• ___ Picchu (site of Incan ruins) — 2011-02-15
• ___ Picchu (Incan site) — 2003-08-14
• ___ Picchu, Peru — 2001-07-19
• ____ Picchu (site of Incan ruins) — 1995-08-04