economy and larger size. But Vratsa was again key for the resistance against the Byzantine, Serbian and Magyar invasions in the Middle Ages. On 1 May 1966 in the village of Sgorigrad, a Mir-Plakanista mine tailings dam collapsed, causing a flood of mud and debris that killed 488 people. It remains one of the biggest disasters in Vratsa since the September 30, 1923 fire and the Anglo-American bombing of January 23, 1944. Tourism The mountains and forests are suitable for development of different types of tourism — hunting and fishing, skiing, speleology, delta-gliding, photo-tourism, etc. Good opportunities exist for exercising different sport activities such as mountaineering, bicycle sport and for those who enjoy being thrilled can go for hanggliding and paragliding, or set out for carting, buggy and motocross racing tracks. Conditions are provided for rest and entertainment — children's and adults' swimming pools, water cycles, discos, bars, restaurants, excellent hotel facilities and good service. To accommodate winter sports enthusiasts, there are rope lines near the Parshevitsa Chalet, and the skiing tracks are said to be well maintained. There are also a Museum of History and an Ethnographic and Revival Complex. Climate Vratsa has a humid continental climate (Dfa). Main sights Ledenika cave Ledenika is the most frequently visited Bulgarian cave. Ledenika is located in the Stresherski part of the Vratsa mountain. Its entrance being at 830m above sea level. It features an abundance of galleries and impressive karst formations including stalactites and stalagmites, dating back a thousand years. The cave is about 300m long and contains ten separate halls. The cave is part of the 100 Tourist Sites of Bulgaria Vratsata Gorge Vratsata Gorge – the highest cliffs on the Balkan Peninsula (400 meters high). Vratsata Gorge is situated in Vratsa Mountain. The area is easily accessible from Vratsa. The limestone of Vratsata Central Wall and the other rocks offer many possibilities for climbing and alpinism, connected by more than 70 alpine routes of all categories of difficulty. Skaklya waterfall Skaklya waterfall - highest temporary waterfall in Bulgaria and the Balkans - 141 meters. Regional historical museum Regional historical museum in Vratsa preserves the Rogozen Treasure - the biggest Thracian treasure that was ever discovered on the territory of Bulgaria The main building of the museum houses several exhibitions. Prehistory Hall Antiquity Hall The Middle Ages Hall The Thracian Treasures Hall The Rogozen Treasure Hall Hristo Botev exhibition Hall