Kennebec Arsenal was built after the war of 1812 to protect borders of the U.S. Then the Arsenal was closed in 1901, and became part of Maine State Hospital and was renamed "Augusta Mental Health Institution". At the institute, 11,647 passed away, and a former patient has came out and said lot's of horrific things happened there causing lots of patients to die. The patients were buried in a unmarked grave, and nobody knows where. In the Augusta Mental Health Institution, they used treatments such as Hydrotherapy, radiant heat, ultra violet rays, diathermy, galvanism, fardism, electric needle, insulin shock treatments, and were injected with different chemicals. The other less harsh treatment was farming and industry treatment, and they had dances every week. In the 1960's they also started to accept alcoholics and people with addiction problems. In 2004 the institution closed and moved to another location and was sold to a developer.
I don't think you can access these buildings anymore because of security, police and developers.