I don't get officials from Bulgaria that often but I've got these two in the same week. I believe they were written by the same person because the handwriting is the same even tought the cards came from different accounts and different users. Its probably the case of a family doing postcrossing because the cards were sent from the same city.
BG-52147, sent by Tsvetomir.
These are beautiful bulgarian nature views, unfortunately there's no identification of the images.
Bulgaria is a country with beautiful landscape and pleasant continental climate. The relief is varied and features mountains and valleys, rivers and plains, lakes and sea.
Some ancient water and volcanic activities have lead to the creation of beautiful rock and cave formations and incredible scenery. The natural wonders of Bulgaria act as an inspirational reminder of the amazing natural diversity of our planet. - in: http://www.mydestination.com/bulgaria/attractions/314848/natural-wonders
BG-52154, sent by Viktoria.
A mix of nature, cultural and architecture bulgarian views: Belogradchik Rocks; Alexander Nevsky Cathedral in Sofia; Etar; Black Sea; Stone Forest in Varna; Plovdiv; Nesebar; Thracian Tomb of Sveshtarid; Rila Monastery; Pirin Mountain; Folk and Koprivshtitsa.