Moai Statues National Wonder Unavailable in Advanced Start

[kazzyliciouz]

Not sure if this is a bug or feature... When doing an advanced start, I am unable to have the option to build the Moai Statues. I tried to in both Classical and Medieval starts and it is not listed in either.

 

[sydhe]

It's a feature.

 

[AlessioCerci]

its an ancient building.