Can you identify these 20 year old LEGO sets? Castle pieces with red bird and tall staircase?
It looks like the bulk of the parts are from The Chamber of Secrets (4730):



As Henrik mentioned, Sorting Hat (4701) is also present:



Jason pointed out that Dumbledore's Office (4739) is also present:



I thought it might be worth noting that these old Harry Potter sets are fairly valuable to collectors. The Chamber of Secrets alone in complete used condition is currently worth ~$100 USD.