where am i?

Clues:

1. This is the largest church in the world.
2. It can hold 18,000 people inside its walls, and the esplanade can accommodate 300,000.
3. Its design is based on St. Peter’s Basilica in Rome, with a 149-meter-tall dome and colonnade forming a Latin cross. 
4. The colonnades are supported by 272 Doric columns, which are up to 31 meters tall.

ANSWER: Basilica of Our Lady of Peace, Yamoussoukro, Côte d’Ivoire