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Visit Sofia and the countryside around on a "free" bike tour, every day at 11:00 and 17:00. Note, for the ride you will need to rent a bicycle with the tour operators. And like always, the word "free" is a euphemism for "tips strongly appreciated". Also, this tour might in addition be a way to market their chargeable tours; always compare before committing to anything.
Central Mineral Baths
Museum of the history of Sofia itself, housed in the colourful old building of the Central Mineral [Water] Baths (built 1913). Exhibits include many luxurious items formerly belonging to Bulgaria's last monarchs.
The only museum in Bulgaria with 4 types of exhibitions – open air, chronological, collections and temporary exhibitions. Over 28 000 exhibits, dated from the Antiquity to the present day. The largest open air exhibition on the Balkans with over 300 pieces of military equipment. The richest collections of weapons, uniforms, decorations, art works, flags, photographs, military equipment, etc.
Has a permanent collection of traditional Bulgarian costumes and a changing exhibition.
Национален исторически музей
The National Museum of History in the Rezidentsia Boyana provide a comprehensive view on Bulgarian history from the prehistory to present, in as broad of a European context as possible. With more than 650,000 exhibits, it is one of the largest history museums on the Balkans, so be prepared to spend several hours. One main attraction are golden and silver mugs and jewellery from Thracian (around 4th century BC) and Roman periods. About half of the exhibits have English captions.