Like Mars or Milky Way bars? Yep, that's the final resting spot of Franklin C. Mars, creator of both.
Showmen's Rest. This is a memorial and burial section for itinerant entertainers, like those who travelled with circuses or other shows.
This is a memorial to the 18 men who were killed in the great Washburn A Mill disaster of 1878.
I'm not sure what this monument is specifically for. There's a poem or phrase for a season on each side.