Some brave souls even scale the tower behind the main building, which is emblazoned with a red star, once rumored to be made of ruby (it's not).

Some believe the site was used for high-level intelligence briefings and diplomatic talks with Soviet officials.

Communism meets co-living in Semkovo, where an entrepreneur wants to transform a hotel built for members of Bulgaria's former ruling party into a more modern hub for digital nomads and remote workers.