Members of the Batak Toba community pray as one of their barefooted members (at far left) enters a mystical state during a Batu Hobon ceremony in Limbong, on the island of Sumatra.

在苏门答腊岛林梦举行的巴图霍邦仪式期间，巴塔克托巴社区成员随着进入神秘的状态一位赤脚成员（左）祈祷。

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Turning east, the forested road (about 60km from Batak) leads to Devin, a small town famous for its mineral water and therapeutic hot springs.

BBC: Bulgarian road trip: Sofia to the City of the Tsars

The city's many ethnic communities - Javanese, Batak, Chinese, Melayu, Indian, Arab - have managed to stay fairly separate, each with their own way of life.

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Head 35km down the B-road, passing Batak (the site of a famous 19th-century uprising against the Ottomans), and continue deeper into the Rhodope Mountains towards Dospot.

BBC: Bulgarian road trip: Sofia to the City of the Tsars