Bulgaria, Starosel - Chetinyyova Moglia Thracian tomb

The Thracian Temple complex near Starossell, discovered in 2000, is the oldest known royal Thracian site. Dating back to the 4th and 5th centuries BC, it includes six temples and several royal burials. The site features unique architectural elements like a granite wall called Crepis, symbolizing the sun. The temple was used for religious ceremonies dedicated to the Mother Goddess, her son, and Orpheus. Archaeological finds from the site are displayed in Sofia's museums.

What unique features do the four temples at the Thracian complex have?

What can be found in the National History Museum and the Archaeological Museum in Sofia?