Step 1: Concept
Classification of entities based on their origin.
Step 2: Analysis
- Eiffel Tower: Man-made structure.
- Statue of Liberty: Man-made structure.
- Great wall of China: Man-made structure.
Step 3: Comparison
Mount Everest is a natural geographical feature (a mountain).
Step 4: Conclusion
Since the others are man-made and Mount Everest is natural, (4) is the odd one.
Final Answer: (4)