Is the Mart rumored to be haunted? You would think with all the misery suffered here, their spirits would not rest.

I would not say haunted, but definitely can feel presence of pain and deep sorrow. I went with my wife and cried uncontrollably after being in there 15 mins, I had to go outside and away from the building to stop weeping. The further we walked away from there, the lighter I felt. I pray my ancestors find peace away from here

Yes

According to the local legends and multiple ghost tours, it is very much a hot spot for sightings.

I've never heard that but I could see that it would be.