Exhibits at this vast museum, the best of its kind in Bulgaria, include 6000-year-old bangles, necklaces and earrings said to be the oldest worked gold found in the world. You'll also find Roman surgical implements, Hellenistic tombstones and touching oddments including a marble plaque listing, in Greek, the names of the city’s school graduates for AD 221. All of the exhibits are helpfully signposted in English, with excellent explanatory text. There's a large collection of icons on the 2nd floor.