I’ve mentioned before that my favorite ancient sites are places in which you are free to roam and explore — and this is one of them. You can begin from the lower entrance by the first parking lot and climb all the way to the top, a half-hour trek that can be exhausting. Of course, I’d never do it in half an hour: There is simply too much to explore in Mystras. The last time I was there I even found a secret trap door that led to a hidden room beneath a church. It took me two hours to get to the top and back down.