1. What was the name of the underground complex used to manage animals and fighters at the Colosseum?

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

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

4. Which desert flower served as the design inspiration for the Burj Khalifa's footprint?

5. What does the name 'Teotihuacan' mean in the Nahuatl language used by the Aztecs?

6. Why does the Chesapeake Bay Bridge-Tunnel include tunnels instead of being a continuous bridge?

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

8. The bronze-colored lattice wrapping the NMAAHC pays tribute to the historic craftsmanship of which group?

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

10. Under which Ottoman Sultan did construction of the Grand Bazaar begin?

11. The dome of the Teatro Amazonas is decorated with 36,000 tiles in the colors of which national flag?

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

13. Which famous 9th-century illuminated manuscript is kept at the Trinity College Library?

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

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

16. What is unique about the construction of the churches in Lalibela?

17. What is the popular nickname of the Woolworth Building, referring to its religious-style architecture?

18. What are the specialized electric locomotives that pull ships through the Panama Canal locks called?

19. How did the Roman army finally gain access to the fortress of Masada during the siege?

20. What material used in the construction of the Theater of Epidaurus is responsible for its incredible acoustics?