Dolni Glavanak Cromlech - Credit: Wikimedia Commons
The Dolni Glavanak Cromlech is an oval stone circle located 2 kilometres west of village of Dolni Glavanak, some 12 kilometres from town of Madzharovo, in Bulgaria. The site is referred to as a cromlech by analogy with similar monuments in Western Europe, but it is the only structure of its kind known in the country. Read more on Wikipedia
Source: en.wikipedia.org