We just learned about the Buda Castle.
Another ancient castle is Spiš Castle, built around 1100 AD in Slovakia, and it over 400,000 square feet.
This castle was owned by the kings of Hungary, and then later was passed on to different families before it was taken over by the state of Slovakia.
At one time in the past the family that owned it abandoned it to move to the nearby village because they said it was not very comfortable.
A little while later there was a big fire and a lot of the castle was destroyed for over almost two hundred years.
The castle has now been fixed up and has a museum inside showing many things from the history of the castle.
(from: wikipedia - spiš castle)
Kid Facts - Blast from the past: State of Mexico