"The Basilica of Our Lady of Peace of Yamoussoukro has a higher
dome and is both longer and wider. However, measures of the latter
include also a rectorate and a villa not stricly part of the
church; its capacity is also much lower: 18,000 people against St.
Peter's 60,000."
"Pope John Paul II insisted as a condition of his attendance of the
consecration that a hospital be constructed nearby. The Pope laid
the founding stone for the hospital. The stone can be seen where he
laid it as a lonely symbol in the middle of a nearby field, as the
hospital has not been built."
That's Wiki for you.