The coliseum was an arena, basically a huge stage. A round (ish) shape provides the biggest number of audience with a good view of what's going on.
Just about any museum in Rome, Italy will offer pictures of the ancient coliseum. This does not come as much surprise though, as the coliseum used to be there. It still is, but it is not anywhere near the shape that it used to be in.
coliseum
Coliseum Books was created in 1974.
To Get in the Pixie Hollow Coliseum you have to go do a quest for Marina and then when you get the badge you can go in the Coliseum. :)
The ancient Romans worked on the coliseum
Roman Coliseum
There was one Coliseum. The Coliseum was an arena. But no other arena was a Coliseum. (Sited, Ms. Berryhill.Feb23.2016)
There was no charge for entering the Coliseum when I was there.
Littlejohn Coliseum was created in 1968.
Pacific Coliseum was created in 1967.
Eccles Coliseum was created in 1967.