Свети Дух, Orthodox church in Boykovo, Bulgaria.

Sveti Duh is a small Bulgarian Orthodox chapel southeast of Boykovo, built of stone with a double-pitched roof covered entirely in tiles. Inside are an altar and icons on the walls, and resting places are set out in front of it. About 20 m away are the traces of an old fortress, called kale locally.

The chapel is believed to have existed since before Ottoman rule. About 20 metres away are the traces of an old fortress (kale). One account holds that this was the Bulgarian border post before the Balkan War, where the first clashes with the Turks began; another identifies the remains as the foundations of the ancient fortress Sveti Duh.

The chapel is dedicated to the Holy Spirit, and on the feast of Sveti Duh a water blessing is held and a kurban (ritual offering) is prepared. The building is a small stone structure with a roof made entirely of flat stone slabs, and icons hang on its walls.

The chapel stands southeast of Boykovo and is reached by a marked forest road with information signs. The small stone building is unlocked all year, so visitors can step inside to see the altar and wall icons. Places to rest are set out in front of it.

About 20 metres from the chapel are the traces of an old fortress, called kale locally. Two stories explain them: one says a Bulgarian border post stood here before the Balkan War and the first clashes with the Turks began from it; the other says these are the foundations of the ancient fortress Sveti Duh.