As part of their social media efforts, a number of sites have posted games, puzzles, and other online activities based on their collections and historic structures/landscapes. To pull them all together (or as many as I could find) - Trailheads Rec Room. Sites have often posted more than one of any type of activity, so I'm embedding one of the most recent and providing a link to their Facebook page so you can look for more.
The State Museum of Pennsylvania (SMP Facebook page)
Trailheads Puzzles (photos by Amy K Fox)
Trailheads Trails of History Bingo - How Many Have You Visited?
Trailheads Trails of History Bingo - How Many Have You Experienced?
Trailheads Trails of History Bingo - How Many Have You Seen on Facebook?