From the Free Comic Book Day DC Comic, The New 52, the Black Room… but what's in it? Here's ten to start you off. Clicky for biggy.
1. The Spear Of Destiny
2. Eclipso's Black Diamond
3. A Demon Knights dragon
4. The Ark Of The Covenant
5. The Green Bell of Uthool
6. Etrigan's armour
7. The Haunted Tank
8. The Viking Prince's longboat
9. A Roman Batman large penny?
10. The Medusa Mask
UPDATE: We can! Martin Januski writes;
1) Soldiers between Eclipso's Black Diamond and a Demon Knights dragon are the from the Terracotta Army:2) The bone chandelier hung in the center of the panel is from Sedlec Ossuary (Church of Bone)3) The markings around the door are a variation of components of The Great Seal
In the comments, Conanach writes;
In the background, directly between 7 and 10 (and next to the ear of the demon head thing in the right-foreground) is a red lantern battery
Just above the Spear of Destiny is what appears to be the Coronation Chair from Westminster Abbey, complete with the Stone of Scone.
Any more for any more?