It is a basketball court. It isn't hard but it looks like it took a very long time to create. I like how creative this person was. I learned that they are were inspired to do this. http://www.minecraftforum.net/forums/minecraft-discussion/creative-mode/361360-basketball-arena
This is a giant arena and it probably holds like 7,500. I like his dedication to this because it looks like it take a long time. I learned that they usually do things like this. http://www.keyword-suggestions.com/bWluZWNyYWZ0IGJhc2tldGJhbGwgc3RhZGl1bQ/
They made like a kinda night club type of arena where like street ball players can play. Doesn't look like it took that long. Same person as before.
I LOVE THEIR DEDICATION TO THIS BECAUSE THEY MADE A JUMBOTRON AN A STANDS THAT CAN PROBABLY FIT LIKE 20,000. I LEARNED THAT THEY ARE PROUD OF THEMSELVES. http://cheesedoctor22.deviantart.com/art/Minecraft-Furniture-Court-327552492