This has been an intermittent ongoing creative mode build for the couple years we have had the console.
It actually started as a bored build of a giant soccer stadium that became the centerpiece.
There was a suggestion to build a mountain. There are two secret entrances as of this post.
Giant play fields or stadia for various sports including ultimate, lacrosse, football, cricket, and basketball. A disc golf course runs through the town. A water slide and a trap range. Even a rocket is ready to launch.
The build is filled with things like giant places to play MtG or do TKD or play Quidditch.
A couple of towers, a skyscraper, and a high up observatory are in a few of the corners.
A giant tree house structure is included.
Over time there were buildings like a brewery, wine cellar, greenhouse, and a myriad of others.
A food truck, pokestop, and campground with outdoor theatre are out there somewhere.
It is now far too big to be viewed from the middle all the way out and I have built to the edge of two rando generated villages and found a third in the distance.
A full mapping and survey really needs to occur at some point. Scale is often comically off. JeffJeffJeffopolis sort of rules.