My parents bought a home that used to be a funeral parlor almost 100 years ago. Dad had never questioned why there was a second bulkhead that went nowhere and when there was a bust pipe they finally had to cut it open
Inside we found a small walled off room that had hundreds of old bottles, odd equipment, chemicals/perfumed salts, stained glass windows from the original building and a few old ledgers accounting books. Parents had no use for it and a local antique shop owner/town historian happily took it when offered.
We had received some cool old copies of photos of how the house originally looked a few years later