The Damascus Incident emphasized nuclear weapon safety like no other public incident to date. On September 18-19, 1980, propellant from a Titan II ICBM ignited and rocked rural Arkansas. The United States military had 5 nuclear warheads in Arkansas at the time. When a maintenance technician dropped a heavy socket down the silo, it punctured the first stage propellant tank filled with aerozine 50. The following explosion created catastrophic site damage.
I contacted the Arkansas Historic Preservation Program to see what materials they have on the site. In 2015, they provided Walks Through History tours of the site. They provided me with a site survey, or Architectural Resources Form.
Upon visiting the site on 11Sept20, I found out that the gate to access the site was locked. Based on the site maps and survey, the remaining cement pads and back-filled silo are located behind the tan barn pictured below. Unfortunately, this piece of history is not readily accessible by simply showing up. I visit Arkansas once a year. I have a year to find out how to visit the remaining site.
Android Auto 
Locked gate at Damascus Titan II missile silo 
Damascus Titan II during the incident response 
Zoom of the Damascus Titan II missile site
You can read more about the incident on Wikipedia at https://en.wikipedia.org/wiki/1980_Damascus_Titan_missile_explosion. Visit the site on Google Maps at https://www.google.com/maps/place/Titan+II+ICBM+Launch+Complex+374-7+Site/@35.4127519,-92.3980489,492m/data=!3m1!1e3!4m5!3m4!1s0x87cda9b2ec84a9eb:0x15d8f2a301e71593!8m2!3d35.4141192!4d-92.3971253.