The Basement
The room itself is not the most interesting part, though it certainly has a history. There are multiple control panels, microphones, and other means of observing and recording. However, it's what they were recording that is most interesting. There are flimsi sketches here of some advanced droids, powerful war machines it looks like. Judging by the notes, though it's archaic Corellian, they were smart, too.
The grime and carbon scoring covers these windows as well, but knowing what they were looking down into now sends all kinds of mixed feelings up the relic hunters' spines. Exhilaration at finding what they were looking for, determination to continue with this mission, and not a little bit of fear. With the power source indeterminate, one or more of those killer machines might still be functional.
There is another door - a very thick, well-locked door - on the North wall in the Northwest corner of the room.