Golyama Arsenalka mound is a Thracian burial tumulus with a subterranean stone building near the Bulgarian town of Shipka. It dates from the end of 5th century BCE.
It is composed of a representative façade, a small antechamber and a domed chamber. The entrances have been closed with double stone doors. The floor of the antechamber is made of rammed soil, while the domed chamber is made up of specially fitted stones. In the center of the domed chamber there is a circular granite block. On the floor underneath it is a cavity surrounded by a ring of stones resembling the cult fireplaces in Seutopolis. Opposite to the entrance, there is a bed with east-west orientation. The temple was used for a funeral of a ruler or a nobleman. It was robbed of its valuables in antiquity, but parts of a gilt breast plate, two small gold ornaments, and bones of horses were found during excavations in the antechamber.
Wikipedia https://en.wikipedia.org/wiki/Thracian_tomb_Golyama_Arsenalka
Address Bulgaria
Coordinates 42°41'58.644" N 25°18'33.493" E