Though the Opera del Duomo chose Brunelleschi's model, it appointed a four-man team to oversee construction, a team that included Ghiberti.

FORBES: Dome of the Brave

"Even that would strike me as being pretty far from their existing business model, " says IDC's Del Prete.

FORBES: Why Apple Won't Become A Phone Company

Sun City, the other great model, is a town of 46, 000 people built by Del Webb on the other side of Phoenix from Anthem.

ECONOMIST: The growth of private communities

Among CNN's journalists at the launch party were Mexican actresses Kate del Castillo and Angelica Vale, Mexican actor and singer Diego Boneta, Mexican actor Eduardo Verastegui and model and former participant of the show "Mira Quien Baila" Maripily.

CNN: STORY HIGHLIGHTS