@Ronkar Thanks for your comment! I have been outside of Sofia.  My travels have taken me to Rila Monastery, Melnik (twice), Rozhen Monastery, Koprivshtitsa (twice), Veliko Turnovo, Gabrovo, Tryavna, Kazanluk, Shipka, Pazardezhik and Plovdiv but my travels have yet to take me to the Black Sea.  So I've gotten around Bulgaria a little bit.  Right now I am working on getting 25 stamps in the 100 best places to visit in Bulgaria book.  Any suggestions for must sees in Bulgaria!?