It was first military land, and later the Nazi transit point and concentration camp. It is very educational and in Prague, in addition to only looking at the gorgeous castle, it is more aware of the country's past. We participate in a day trip to MartinTour, and can sign up at the bus stop or the visitor center of Republic Square/Old Town Square. The old gentleman who explained is very familiar with the Czech Republic, and Yanlu also introduces the city! Highly recommended, the child and I have a valuable history class!