How big is Harrenhal? Can you establish the dimensions of it? Is it possible to compare with other castles and landmarks of Westeros and the real world?

Harrenhal is enormous: if it’s three times the size of Winterfell, that means it’s 270,000 square meters. That’s almost as big as the Palace of the Parliament (the world’s largest civilian administrative building in the world, built by Ceausescu), and slightly bigger than the Hofburg Palace in Vienna, bigger than the Louvre in the France, and so on.

If we’re going by castles alone, it is almost four times the size of Prague Castle, the largest ancient castle in the world. So you can see why it’s such a white elephant.