Greetings Cassandra:
Fortunately, I'm very familiar with Funks Grove in McLean County. Without a picture image to base my answer upon, I'm going to go out on a limb (ha-ha) and say the tree might be black locust (Robinia pseudoacacia). It has seed pods and thorns on its branches. However, I can't say that it has bark similar to baldcypress or much of a pyramid shaped crown. Now, there is a tree located in the area you are describing that is called Dawn Redwood, which is very similar in appearance to baldcypress but does not have seed pods like a legume (redbud, honeylocust, Kentucky coffeetree, black locust, etc.). However, the Dawn Redwood at Funks Grove is more like 60-ft.
Check the two trees I mentioned above (black locust & Dawn Redwood) on the Web to see if one of them resembles the tree you stumbled across in Funks Grove...