Take a look at the oldest standing building within Algonquin Park!
Built in 1892 it is still in remarkable shape. Located at kilometre 21.3 (turn onto Turners road off Round Lake road and reset your odometer) this building was originally built as a logging depot. It has since been used as a post office, successful potato crop, lumber camp, homestead and much more. The inside is still in remarkable shape and there is an Ontario Parks guestbook so be sure to sign it while you're there. There are also two fenced in graveyards nearby, one is across the road and towards the clearing and the other was right before the bridge across the street.
Want to stay nearby? You could camp in Bonnechere Provincial Park or reserve one of two Algonquin Backcountry sites nearby.