1. The Great Wall of China was primarily built to protect against invasions from which group?

2. Angkor Wat was originally dedicated to which Hindu deity before becoming a Buddhist site?

3. The geometric design of the Sydney Opera House shells was inspired by which simple object?

4. To what does the name 'Big Ben' technically refer?

5. Until 2018, which statue held the record for being the tallest in the world?

6. What type of movable bridge mechanism is used to raise the spans of Tower Bridge?

7. What is the most common geometric shape of the basalt columns at the Giant's Causeway?

8. Approximately how many times is the CN Tower struck by lightning each year?

9. What did architect Bernini intend the massive colonnades of St. Peter's Square to represent?

10. What architectural style is the Mercado de San Miguel most famous for?

11. What real-world engineering feature of the Palais Garnier inspired the 'underground lake' in The Phantom of the Opera?

12. The shape of the modern Bibliotheca Alexandrina is intended to represent what celestial object?

13. What makes the Tower of Hercules unique among all other Roman lighthouses?

14. The tripod-shaped structural system used to stabilize the Burj Khalifa is known as what?

15. What is the primary engineering benefit of the Shanghai Tower's 120-degree spiral shape?

16. The Grand Canal connects the current capital, Beijing, to which southern city?

17. What natural barrier made escaping from Alcatraz nearly impossible for inmates?

18. The 272 steps and massive golden statue at Batu Caves are dedicated to which deity?

19. What technology is primarily used to propel the water in the Bellagio Fountains to such extreme heights?

20. What is a popular way to explore Bangkok’s canals?