The document discusses Khust castle in Ukraine. It was built in the late 12th century and was one of the most well-protected castles, never being captured by invaders. However, in 1768 it was destroyed by lightning during a terrible thunderstorm. The document also mentions there are about seven old churches and cathedrals in the town of Khust that are worth visiting to see nice paintings and frescoes on the walls, including a new cathedral located in the central square.