More plumbing today. I was hooking up the claw foot tub with new waste/overflow and supplies and a scrounged faucet when I realized the drain line(fairly recent pvc) had no trap for the tub waste. I already knew the bathroom pedestal sink was improperly plumbed with no trap...but the tub too? So I cut and capped the existing hard to reach drain(bathroom outer wall hangs over the foundation about 24") and re-routed it inward to a reasonable and accessible area and included a trap.

Here's a picture of the structure that was possibly a fish pond. It's concrete foundation seems to run quite deep and be substantially built. Maybe it will become a foundation for a tool shed- like one that overhangs the foundation 12" on all sides, making it about 6'x6'. Or possibly a fire pit. We'll see- it needs to be excavated a little more to determine if there is a bottom.