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A unique (for Bulgaria) underground tomb or cult site. It's dated to the 2nd to 4th centuries and consists of a large round chamber with a diameter of 11.60 m and a height of 5.5 m, covered by an earthen mound. The main chamber is reached via a 22-m-long tunnel, flanked by two side chambers near the entrance. In the centre of the main chamber, a hollow pillar leads upwards. It's often called a tomb, like the many Thracian funeral barrows in the country, but its brick construction is characteristic for the Roman era and an alternative interpretation considers the site a heroön - a sanctuary dedicated to a legendary hero. You can also climb up the tumulus to get a great view of the whole area. If you come from the north, e.g. from Varna, Sunny Beach or Pomorie, the access to the tomb is after the second turnoff to Pomorie, shortly after the "Europe" campsite (left) on the right-hand side; there are also signs. Since the parking is on a very confusing curve, be sure to pay attention to the traffic when driving off.