1. Is this AI?
Answer: AI
2. Is this AI?
Answer: Not AI
Explanation: The Kelpies are monumental steel horse-head sculptures between Falkirk and Grangemouth in Scotland; image attribution: Steven Straiton.
3. Is this AI?
Answer: AI
4. Is this AI?
Answer: Not AI
Explanation: Mano del Desierto is an 11-metre-tall hand sculpture in Chile’s Atacama Desert; image attribution: Nicolas Valdes Ortega.
5. Is this AI?
Answer: AI
6. Is this AI?
Answer: Not AI
Explanation: The Golden Bridge in Vietnam is supported by giant hand sculptures designed to look ancient; image attribution: Trung Le.
7. Is this AI?
Answer: AI
8. Is this AI?
Answer: Not AI
Explanation: Rakotzbrücke is a bridge in Germany whose arch and reflection form a circle; image attribution: A.Landgraf.
9. Is this AI?
Answer: AI
10. Is this AI?
Answer: Not AI
Explanation: Fly Geyser in Nevada developed its unusual shape as mineral deposits accumulated after drilling released hot water; image attribution: Jeremy C. Munns.
11. Is this AI?
Answer: AI
12. Is this AI?
Answer: Not AI
Explanation: Dongdaemun Design Plaza in Seoul was designed by Zaha Hadid, with sweeping curves and a metallic exterior that glows at night; image attribution: Warren Whyte.
13. Is this AI?
Answer: AI
14. Is this AI?
Answer: Not AI
Explanation: Dragon’s blood trees grow on the Socotra archipelago and are known for their umbrella-shaped crowns; image attribution: Alex38.
15. Is this AI?
Answer: AI
16. Is this AI?
Answer: Not AI
Explanation: The Giant’s Causeway in Northern Ireland has basalt columns formed as lava cooled and contracted; image attribution: Chmee2.
17. Is this AI?
Answer: AI
18. Is this AI?
Answer: Not AI
Explanation: Grand Prismatic Spring in Yellowstone National Park gets its colourful edges from communities of heat-loving microorganisms; image attribution: Jim Peaco, National Park Service.
19. Is this AI?
Answer: AI
20. Is this AI?
Answer: Not AI
Explanation: Leafy sea dragons are relatives of seahorses whose leaf-like appendages help them blend into their surroundings; image attribution: Derek Ramsey; derivative edit by Papa Lima Whiskey.
21. Is this AI?
Answer: AI
22. Is this AI?
Answer: Not AI
Explanation: Barreleye fish can rotate their eyes inside the transparent shield covering their heads; image attribution: MBARI (© MBARI).
23. Is this AI?
Answer: AI
24. Is this AI?
Answer: Not AI
Explanation: The thorny devil has tiny grooves in its skin that carry water towards its mouth; image attribution: Bäras.
25. Is this AI?
Answer: AI
26. Is this AI?
Answer: Not AI
Explanation: The shoebill gets its name from its large, shoe-shaped bill; image attribution: Olaf Oliviero Riemer.
27. Is this AI?
Answer: AI
28. Is this AI?
Answer: Not AI
Explanation: The dumbo octopus (Grimpoteuthis) is named for its ear-like fins; image attribution: NOAA Okeanos Explorer.
29. Is this AI?
Answer: AI
30. Is this AI?
Answer: Not AI
Explanation: The Terracotta Army consists of thousands of life-size clay figures guarding the tomb of China’s first emperor; image attribution: Museum of the Terracotta Army/PA.
31. Is this AI?
Answer: AI
32. Is this AI?
Answer: Not AI
Explanation: The Ivanpah solar facility in the Mojave Desert uses mirrors to focus sunlight onto tower-top boilers; image attribution: Jim West, Alamy.
33. Is this AI?
Answer: AI
34. Is this AI?
Answer: Not AI
Explanation: Red Rocks Amphitheatre in Colorado sits between towering formations of ancient red sandstone; image attribution: Shutterstock.
35. Is this AI?
Answer: AI
36. Is this AI?
Answer: Not AI
Explanation: This surviving portion of Charles Babbage’s Analytical Engine includes its printing mechanism; image attribution: Science Museum.
37. Is this AI?
Answer: AI
38. Is this AI?
Answer: Not AI
Explanation: This colourful monument was created for Valencia’s 2019 Fallas festival; image attribution: Falconaumanni.
39. Is this AI?
Answer: AI
40. Is this AI?
Answer: Not AI
Explanation: A zonkey is a zebroid born from a zebra and a donkey, combining a donkey-like body with zebra stripes; image attribution: Gianni Pasquini / la Repubblica.
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