Sorry for translator!
They call this castle gate to hell, because only by passing through the walls, it is possible to get into the spooky trail leading into the mountains, the mountains every few hundred years, which brings the surrounding lands as a fiery cataclysm emissions. Among the many legends of people on it, including this saying that the mountain is angry when plunging into her travelers, but you rarely come back safe and sound. So the king gave an absolute prohibition to follow the trail and built fortifications on the network designed to deter potential adventurers and invaders. These, however, can find a lot, because the wealth offered by the mystical mountain is enormous. Some came back from there happily with gallons of gold and diamonds sacks, while the other ear is missing. Do you find yourself still some heroes who are willing to follow the ghostly trail? Probably yes, but first they have to get the lock!