The ancient wall is 13.7km long and about 12m wide on top. You can hire bikes (RMB 40) and cycle the whole way. The other option is an electric car (also RMB 40 per person) which runs from gate to gate. The wall has been extensively restored and is obviously well maintained. We didn't have a long time to spend but will allow more time next visit as it is well worth it. Another Xi'an must see.