Not really old hammer but this is my next offering. I have seen this "building" on several peoples tables and managed to pick a cheap one up on Ebay.
Gormiti Temple.
Glued shut and some fine plaster to fill in some of the holes and other bits; such as a button that when pressed releases a "rock hammer" and another that opens the trap door on the front balcony!

Black under coat and a fine coat of Abbadon Black on the bits that where missed.
Monk and Mystic Warrior for scale purposes - yes it really is that big!

Dry-brushed with various grey paints and a final top light of off white. Finished with hand painted tripled layer lightening bolts on the front panels
