Before you do any expensive landscaping, try to find depressions where the old outhouses were. Dig them up and find a whole array history from bottles, gold, crockery to weapons and, yes, skeletons. Good place to hide the guy who knocked on the door in 1776 looking for a meal or lodging. Would you look in the pooper?
This is a good suggestion. It's not likely that there will be priceless finds, because people really did not throw gold or other valuables down the midden. But there may be items that are treasures of sociocultural information.
Don’t worry about expensive landscaping, no $$ for that, but when my husband put the geothermal tubes in he did dig around and found old bottles. Unfortunately he wasn’t thinking of searching the property then :(