Think about the post on beauty yesterday, collections are a wonderful way for some children to linger and enjoy the beauty of many different types of things. Even young children love studying objects closer with magnifying glasses and microscopes (the inexpensive Intel microscope is great for this). Collections can be unorganized or organized, and natural or man-made. Antiques Roadshow can also be a surprising hit with your children, and introduce them different periods in history, inventions, and art. Check out Smithsonian's nice site for Kids & Collecting.
Smithsonian IdeaLabs: Amazing Collections