In the 2013 remake of , you can collect 10 Castle Statue Pieces to unlock statues in the castle foyer. Finding these pieces is a key part of reaching 100% completion in the game. Castle Statue Piece Locations
The statue pieces are hidden across the five main worlds. Each world contains two pieces, typically found by exploring hidden paths or using Mickey's "bounce" ability to reach high platforms.
If you are looking for other specific collectibles, you may also want to find the or the 71 Chili Peppers hidden throughout the levels.