The best site for Bulgarian Property is EuroPropertyMap. For land plots and apartments in Montenegro click on montenegro property. There are also many tempting residences in croatia.

The city of Veliko Tarnovo is just to the north of the central balkan range. This city was the ancient capital of Bulgaria, and boasts a spectacular display of traditional buildings - set on the side of a gorge through which the river Yantra runs.
This city takes a while to get to, about 4 hours car drive from either Sofia or Varna on the coast.