1. What is the name of the narrow, 1.2-kilometer-long gorge that serves as the main entrance to Petra?

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

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

4. In which room of Versailles was the 1919 treaty ending World War I signed?

5. From which region in Wales were the 'bluestones' of Stonehenge transported?

6. What part of the original colossal lion gate at Sigiriya still exists today?

7. Which woman is credited with managing the final years of the Brooklyn Bridge's construction?

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

9. What did the Old Russian word for 'Red' (krasnaya) also mean when the square was named?

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

11. The stones of the collapsed Lighthouse of Alexandria were repurposed in 1480 to build which still-standing structure?

12. Which Queen of Egypt commissioned the construction of the Unfinished Obelisk?

13. What lies directly beneath the vault of the Arc de Triomphe?

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

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

16. Unlike the Panama Canal, why does the Suez Canal not require a system of locks?

17. What material were the chandeliers in the Chapel of St. Kinga carved from?

18. What was the original 19th-century functional purpose of the Jet d'Eau?

19. In what year did the Maracanã host its first FIFA World Cup final with a record-breaking crowd?

20. The Millau Viaduct is taller than which other famous French landmark?