Three of the Seven New Wonders of the World are featured in this program. Mexican archaeological site Chichén Itzá has some of the most impressive pyramids, temples, and palaces of the Mayans' competing city-states. The Maya possessed extraordinary mathematical, astronomical, and engineering skills, but religion was the primary source of these sophisticated structures. China's Great Wall is the largest man-made structure on earth. Of the thousands of enslaved laborers who worked on it, many died and were buried within the structure itself. Today, the Great Wall is still the primary symbol of Chinese civilization. A statute of Christ the Redeemer stands atop one of Rio's several peaks. Begun in 1927 and inaugurated in 1931, the towering statue has both political and religious significance.