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National Museum of History - Lonely Planet
Housed in the former communist presidential palace, this museum occupies a stunning, if inconvenient, setting; unless a coach party turns up, you may have the place to yourself.
https://www.lonelyplanet.com/bulgaria/sofia/attractions/national-museum-of-history/a/poi-sig/1114879/358779
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National Museum of Natural History, Sofia (NMNHS)
Being the first and the richest natural history museum on the Balkans, the National Museum of Natural History in Sofia (NMNHS) studies, preserves and disseminates information about the living and non-living nature both in Bulgaria and throughout the world.
http://www.nmnhs.com
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National History Museum, Sofia City - Official Tourism Portal of Bulgaria
The National History Museum is one of the largest and richest history museums on the Balkan Peninsula. More than 700,000 cultural monuments are preserved inside it, representing the history of the present Bulgarian lands from the period 8,000 years ago to the present day. Only 10% of all these valuables and monuments are exhibited in the museum halls.
http://bulgariatravel.org/en/object/298/Nacionalen_Istoricehski_Muzej
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National Museum of History (Sofia, Bulgaria): Top Tips Before You Go (with Photos) - TripAdvisor
Book your tickets online for National Museum of History, Sofia: See 283 reviews, articles, and 293 photos of National Museum of History, ranked No.15 on TripAdvisor among 183 attractions in Sofia.
https://www.tripadvisor.com/Attraction_Review-g294452-d550254-Reviews-National_Museum_of_History-Sofia_Sofia_Region.html
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National History Museum - Sightseeing in Sofia
22,000 exhibits show the development of social, cultural and political life on Bulgarian soil. From the first prehistoric settlements through to the National Revival period and the Bulgarian State 1878 – 1945; covering the Greeks, Romans, First Bulgarian Kingdom in the Middle Ages and the Byzantines.
https://www.inyourpocket.com/sofia/national-history-museum_77198v