Across
- 6. Ancient citadel located in Athens
- 7. Large ocean wave caused by an underwater earthquake
- 8. Triangle Mysterious region where ships and planes have allegedly vanished
- 13. Legendary Greek hero known for his twelve labors
- 17. The highest mountain in the world
- 18. NASA program that landed humans on the Moon
- 21. Sculptor of David and painter of the Sistine Chapel ceiling
- 22. Planet known for its deep blue color
- 23. Monument featuring four U.S. presidents
- 25. French leader exiled to Elba
- 28. Space telescope that helped expand our understanding of the universe
- 29. Physicist known for the theory of relativity
- 30. Capital of the United States
- 31. Ancient structures built by the Egyptians
- 33. Natural feature that erupts molten rock
- 35. Mythological Titan who held up the sky
- 37. Roman goddess of love and beauty
- 41. Classic arcade game featuring a yellow character eating dots
- 42. Famous Parisian landmark
- 43. Famous ship that sank in 1912
- 44. Natural light display in the Earth's sky, seen in polar regions
- 45. Pioneers of aviation who built and flew the first airplane
Down
- 1. Massive fortification built to protect China
- 2. Fastest planet to orbit the Sun
- 3. Force that attracts objects toward each other
- 4. Largest planet in the solar system
- 5. Genetic material in all living organisms
- 8. Composer of Fur Elise and Symphony No. 9
- 9. Renaissance artist and inventor who painted Mona Lisa
- 10. Planet known as the Red Planet
- 11. Engineer and inventor known for his work with electricity
- 12. The world's largest rainforest
- 14. Inventor of the printing press
- 15. Stone Artifact that helped decode Egyptian hieroglyphs
- 16. Last active ruler of Egypt's Ptolemaic dynasty
- 19. Bang Scientific theory explaining the origin of the universe
- 20. International sporting event held every four years
- 24. Dwarf planet formerly classified as the ninth planet
- 26. Process by which plants convert sunlight into energy
- 27. Scientist who formulated the laws of motion
- 32. Space shuttle that tragically exploded in 1986
- 34. Playwright who wrote Hamlet and Macbeth
- 36. Lizard known for its ability to change color
- 38. Greek god of the sea
- 39. Picchu Incan city built high in the Andes Mountains
- 40. Painter known for his Impressionist works