The height of my walking tour is the Prague Castle, which is a huge complex built on an elevated part of the city - a hilltop, actually. You see, it is the center of political, religious, and social activities. The castle has both the charm and weight of a truly old structure, one where the Bohemian monarchs of centuries past lived. There is also a moat, gardens, and of course, thick, thick walls that were always important among warring leaders.