Ancestry Colliseum

In the Four Rogue Stars series, the abandoned Ancestry Colliseum is a roman-style colliseum in the middle an arizonian desert. It's the place where the main four protagonists battled with theirselves after stepping into the arena of the colliseum. Its name derives from the abandoned "half-ruins, half-intact" state Joe Strauss stated. Said colliseum's arena is below the normal land level, and it's sand tinted appearance can blend well with the rest of the desert.