The place where birds bathe, of course!
Actually, bird baths can be a lot of fun. Typically they attract more, and a wider variety of birds than a bird feeder. This is because of their universal appeal. All birds like to bathe (well, nearly all). Birds are much pickier about their food though. Certain types of food attract only certain types of birds, so a birdfeeder attracts only a few species.
If you get a bird bath, be sure to maintain the purity of the water (remember the birds drink it too) and keep the birdbath clean. Contamination from chemicals / herbicides / insecticides can hurt the birds and cause defects in their eggs. So there is some maintenance to be done.