Abandoned Asylum.
The old building, a former 'lunatic asylum' in Columbia, South Carolina, opened in 1821, and was used to house traumatized veterans from the American Civil War from 1861 to 1865.
Read more: http://www.dailymail.co.uk/news/article-3985462/Inside-South-Carolina-Lunatic-Asylum-Civil-War-veterans-treated-PTSD-building-abandoned-left-crumble.html
photogrammetry from youtube video