China

If you like medieval forts you'll love Xi'an.

At the heart of Xi'an is a 14 square mile city laid out as a perfect rectangle surrounded by a massive wall. The wall is 40' high, 60' thick at the bottom, 40' thick at the top, and it's surrounded by a moat. It's further protected by corner towers, watch towers, and ramparts, all of which are connected by a wall-walk along the top hidden behind a parapet.

The wall walk takea 4 hours on foot, we'll use suspension bikes!