Historical clue formulations

• Half Dome's home — 2018-12-22
• Apple operating system that's also a geographical name — 2016-09-09
• Subject of many Ansel Adams photos — 2016-08-21
• Half Dome's home — 2008-09-06
• Home of the 1,612-foot Ribbon Falls — 2008-07-03
• California national park — 2006-11-20
• Tuolumne Meadows locale — 2006-04-07
• California hikers' mecca — 2005-05-03