- ...that Perperikon (ruins pictured), an ancient Thracian city, is the largest megalith ensemble in the Balkans?
- ...that an ore-miner settlement existed on the present location of Chiprovtsi since Thracian times, and was Kiprovets by the Slavs who inhabited it?
- ...that during the period of Communist rule, Dobrich was renamed Tolbukhin , but was renamed back to Dobrich by presidential decree in 1990?
- ...that Vardim Island, the third largest Bulgarian Danubian island, is a protected wetland and bird nesting area of national importance?