[Answer] 9. I am standing on top of one of the oldest and biggest man made structures on the planet which is at least 6,352 km (3,948 miles) long. What is it?

Step 1 : Introduction to the question "9. I am standing on top of one of the oldest and biggest man made structures on the planet which is at least 6,352 km (3,948 miles) long. What is it?"

...1. The Great Pyramid at Giza 2. The Great Wall of China 3. The Empire State Building 4. The Hoover Dam Construction of the great wall started in the 7th century BC, with various small states in Northern China building wall. The walls were adjoined during the Qin Dynasty and extended upon during the Ming Dynasty, the renovation and extension, which resulted in the wall we see today, lasted over two thousand years.

Step 2 : Answer to the question "9. I am standing on top of one of the oldest and biggest man made structures on the planet which is at least 6,352 km (3,948 miles) long. What is it?"

The Great Wall of China:

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