formal if something is in situ, it is in its original place.
The cave paintings must be viewed in situ because they are considered too delicate to be moved to a museum.
in situ
In something's original location or position. The term is Latin for "in place." The bones have been kept in situ so as to preserve their perfect arrangement.
in ˈsitu
(from Latin) in the original or correct place: Much of the original furniture has been left in situ so that we can view the room almost as it looked a hundred years ago.