Half-off topic/rant: I would love if trip route planning tools could take into account public open/close time information. Twice I've been in the South Dakota area on road trips, and each time I miss being able to see the Minute Man silo site near Rapid City because they lock the fence up around it outside of visitor hours for security reasons:

http://www.nps.gov/mimi/planyourvisit/hours.htm

TL;DR Please incorporate open/close time data in travel planning apps!