There are a lot of interesting, and unique skate parks out in the world around us. Most of them are very cool, and are located pretty close to us. For example. There is 885 skate park. 885 skate park is located on West Mifflin road. 885 skate park is a very good skate park for beginners and intermediate skaters. It has all the things for you to practice new tricks and grinds on. They have half pipes, rails, quarter pipes, etc. I would suggest that beginner skaters practice here. If you have never skated in a half pipe before, either, then this is a great place to learn how to drop in, do stalls, and learn grab tricks. I would say that this park is a good skate park. Also 885 has a skate shop next to the shop, incase you have questions about your board, and such. The shop sells all kinds of skateboarding equipment like helmets, pads, clothing, bearings, wheels, trucks, decks, etc.
Another skate park, is FDR skate park located in Westchester, Pennsylvania. This is a more complex skate park, where more advanced skaters like to practice their skills in  the half pipes, bowls, rails, and such. This is an overall great skate park. It is even the local skate park to "Bam" Margera, a professional skater. FDR is a great skate park for the more advanced skaters to practice their skateboarding skills in the steep half pipes, slick bowls, and waxed rails. I would recommend this skate park to all levels of skaters. 
Last but not least is Dreamland skate park. Dreamland is located in Redmond, Oregon. Most of the park is made entirely out of concrete. It also has a lot half pipes, rails, quarter pipes, etc. It is a good park, also. I would recommend it to intermediate skaters.
Home Pro Skaters Skateboard Assembly