"For many years visitors continued to gain access inside the Buzludzha Monument through broken doors and windows, even after entry was officially prohibited. Now however, these entry points have been sealed and a guard watches over the site 24/7. (For a discussion of why this is a good thing, please see this news post.)"
https://www.buzludzha-monument.com/visit
"For many years visitors continued to gain access inside the Buzludzha Monument through broken doors and windows, even after entry was officially prohibited. Now however, these entry points have been sealed and a guard watches over the site 24/7. (For a discussion of why this is a good thing, please see this news post.)"
http://www.buzludzha-monument.com/news/2018/5/20/security-guard-posted-at-buzludzha