Prepare to Be Amazed: The World's Most Expensive Construction Marvels Revealed: Prepare to Be Amazed: The World’s Most Expensive Construction Marvels Revealed
yht1. Mecca's Great Mosque Where: Saudi Arabia Completed Year: Unfinished; Total Cost: $100+ Billion For almost two millennia, the Great Mosque in Mecca has been undergoing renovations at an astounding…