"OK, let¡¦s begin with the big one: what the hell is Iapetus!?
Actually, it¡¦s easier to begin with what it¡¦s not: apparently, a
natural untouched moon ¡K."

"An entire spaceship world ¡K trapped in orbit ¡K around Saturn...

"An irregularly shaped, Iapetus-sized body is something quite unusual
in the solar system"

"Now that we have identified several striking areas on Iapetus -- each
exhibiting large-scale, unquestionably geometric surface features,
which, together, present a highly provocative case for intelligent
construction"

"The remains of a deep, massive ¡§equatorial reinforcing ring¡¨ -- which
was used to literally join the two hemispheres of this ¡§artificial
moon¡¨ together!

http://www.enterprisemission.com/moon3.htm