The Mill Stones (called "Stonehenge" by local people), after which the hotel restaurant was named, are located near the Zvánovice stream - on the boundary of cadastral area of Zvánovice and Černé Voděrady (partly on the Legner Hotel Zvánovice grounds). The Mill Stones are granite cylinders with a diameter of 80-125 cm and a heigh of 35-65 cm, their weigh is estimated at 460-2100 kg. Some of them have a small hole carved in the middle. On the left bank of the Zvánovice stream there is a granite rock wall with visible signs of the stone quarrying. The most notable part of this rock is a place where unfinished granite wheel is.
The origin and purpose of the Mill Stones are very discussed. According to some findings, they may come from the pagan times and they were a part of a sacred building which stood on a hill above the stream. From this place they were rolled down into the valley. Another assumption is that the stones were used as granite pedestals for wooden statues of pagan gods.
In the 70´s archaeological survey was conducted. According to its result, the stones were specified as a semi-products of the mill stones, which were produced here in the Middle Ages. The stones were used for grinding ore minded in a local area.
What was a surprise, was the number of the stones. During the archaeological survey they found 45 pieces, but there were even more which were destroyed in the early 20th century when local road was built.
In the vicinity of this monument there is a large National Nature Reserve Voděrady Beechwood, where you can walk in the nature untouched by man. It is an ideal place for long walks, mushroom picking, biking, but also swimming in beautiful local ponds. There is also the Kamenka Quarry from which one of the foundation stones of the National Theatre comes from.