In October 1972, an excavator operator digging a trench for an electric cable on the edge of Varna turned up some gold, and archaeologists soon found a cemetery from around 4600-4200 BC full of gold jewelry, scepters and ornaments. The Varna Necropolis holds the oldest large hoard of worked gold yet found anywhere in the world, older than the pyramids, and it's the best reason to come to Bulgaria's third city. Since then, Varna has been the Greek colony of Odessos, a Roman port with huge baths, a Byzantine fortress, an Ottoman stronghold, and from 1949 to 1956, briefly, a city called Stalin.
Today it's Bulgaria's summer capital, the biggest city on the Bulgarian Black Sea coast, with a long seaside park, beaches right below the center and a summer of festivals. It isn't a resort town, though, and that's its strength: Varna is a real city with a port, a university, a cathedral and a busy pedestrian center, and it works outside the beach season too.
Day one is the old town and its museums, day two the Sea Garden and the beaches, day three the coast north to the cave monastery of Aladzha, day four the first capitals of Bulgaria at Pliska, Madara and Shumen, and day five the Stone Forest, the battlefield of 1444 and the cape of Galata. From October to April most museums are closed on Sundays and Mondays, so start on a Tuesday. For the rest of the country, see Bulgaria and the Sofia guide.