The user uploaded three photos to the thread which showed the door and inside the room.
People took to comment on the thread, with one person writing: “I have a similar room through a tiny door in a closet in the finished attic space behind the walls.”
A second said: “Not knowing your exact location makes it hard to pinpoint its use exactly…
“But I think a room like that would be similar to the secret rooms created during the Revolutionary War (100 years prior to your house being built) as well as the Civil War; which lines up date-wise.
“As those secret rooms were mainly used to hide valuables and store food so enemies wouldn’t confiscate/loot them.”
Another commented: “I had a small room behind my closet as well in my 1895 home.”