Imber village has been uninhabited since 1943 and has been out of bounds to the general public ever since. The MOD do however open the village and surrounding access roads for a few days several times per year, this is usually over the Easter bank holiday weekend, August bank holiday weekend and between Christmas and New Year. The vast majority of the village has been replaced by building shells for military training, but the church is still there and is open and manned by volunteers occasionally during accessible periods. Loads more info can be found here.
I visited during the Easter bank holiday weekend, a family trip in the morning and then an evening visit on my own later that day. On a nice day it’s a busy place with loads of people wandering around, but it’s not exactly what I’d call a family day out. There are refreshments available from the church when it’s open, but there are no loos or any other facilities. It’s also worth bearing in mind there is zero phone reception for a good mile or two in any direction, try not to break down!
Aside from the church none of the buildings are accessible and strictly speaking you should never leave the road when wandering around, unfortunately loads of people ignore this and treat it as a bit of a theme park. As a place to photograph it’s really interesting, the lengthy access roads across the plain offer up plenty of opportunities with completely untouched landscapes (the occasional destroyed tank aside) that can be photographed from the roadside. My evening trip was extremely eerie with nobody at all around, you quickly realise how lost you’d be without any phone reception whatsoever.