Final answer:
The Pyramids of Egypt are the most widespread and found on most continents.
Step-by-step explanation:
The most widespread and found on most continents among the given options is The Pyramids of Egypt.
The Great Wall of China is located only in Asia and does not exist on other continents.
The Eiffel Tower is located in France and does not exist on other continents.
The Amazon Rainforest is a natural feature and cannot be found on all continents either.
On the other hand, the Pyramids of Egypt can be found in Africa, specifically in the country of Egypt. They are the most well-known and iconic structures in Egypt and are known worldwide.