1. The Eiffel Tower is located in which city?

2. Why were the minarets of the Taj Mahal designed to lean slightly outward?

3. What do the seven rays on the crown of the Statue of Liberty represent?

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

5. Which river is responsible for the erosion that created the Grand Canyon?

6. What material covers the exterior of the Guggenheim Museum Bilbao, giving it its shimmering, scaly appearance?

7. What surprising factor has helped the Leaning Tower of Pisa survive multiple earthquakes?

8. The design of the Oriental Pearl Tower was inspired by which traditional art form?

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

10. What is the nickname for the notoriously critical fans who sit in the highest gallery of La Scala?

11. The Clementinum Library is a world-renowned example of which architectural and artistic style?

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

13. What was the name of the underground complex of tunnels and elevators beneath the Colosseum's arena floor?

14. The Gateway of India was built to commemorate the 1911 visit of which British monarch?

15. What was the traditional method for monks and supplies to reach the monasteries of Meteora before stairs were carved?

16. According to local legend, how did Guru Padmasambhava reach the site of the Tiger's Nest?

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

18. The water for the Trevi Fountain is supplied by which ancient Roman aqueduct?

19. What environmental benefit does the Rain Vortex provide to the Jewel Changi complex?

20. What natural disaster in 1117 AD destroyed the outer ring of the Arena di Verona?