Yes I've been there as well Carl and was taken down the steps by an archaeo when they were opening up a large trench at the base of the mound. Funnily enough the thing that always springs to mind first is the tube lighting they had wrapped around the hand-railing to the steps.
I didn't feel uncomfortable at all down the bottom just totally in awe of what our ancestors had done.
When I first entered the site I thought the 'hut' on the top of the mound was the workers privy!!! Haaaaaa haaaaaa