Huge excavation crater in the mountain near village of Skravena, Northern Bulgaria. The place was once a concentration camp and most of excavation is hand made. Village of skravena was an important point for Bulgarian liberation uprisings and that is why it is included in one of the 100 tourist sites of Bulgaria. In the village a memorial ossuary is built where 10 of the skulls of rebels of Hristo Botev detachment have been exposed since 1982. There is Skravena cove in Livingston island, named after the village of Skravena.