The Booth World depicted on the series was roughly 7,900 miles in diameter and 40,000 in circumference. Of course, we can't supply you with your own alternate Earth - that's purely the realm of science-fiction. No, you'll have to construct your own.
Make a Booth World!
Alternatively, we suggest the next best thing: wrestling Pluto's moon Charon into the Earth's orbit, and planting your booth there.
All you'll need at this point are an atmosphere, some flora and fauna, oh-- and a life.
If you make a Booth World, devastating coastal cities as it wreaks havoc on the Earth's tides, let me know! I love feedback from people.
I knew I shouldn't have used up all my screen caps in the last section.