Bradford Lee Gilbert built Dundas in the early 1800's as a summer lodge. It was originally named "Craig E Clair" after his wife's hometown in Scotland. Gilbert passed away in 1911 and was sold and ended up in the hands of Ralph Wurts Dundas in 1915. He started construction but passed away in 1921 and was never able to see the final product of the castle. Once he died, his wife Josephine was committed to an asylum and their daughter Muriel inherited the house and their fortune. The fortune was then stolen by the caretakers of the castle, and she went on to get married and move to England. It was then used as a children's camp, masonic retreat, and now sits abandoned.
There is a caretaker, but I think you still might be able to get in.