Questions for you!!!

My dear students!
You've done a great job! You have collected wonderful material about the most exciting and famous sights of the world. Now it's time to check how attentively you read the posts.
1.Which structure is the most visited monument in the world?
2.How long was Cheops pyramid constructed?
3. What does the Kremlin historic complex include?
4. Which place is somehow connected with the Bible?
5. How were the Niagara Fall formed?
6. Why and which side does the Tower of Pisa lean?
7. When was the Ostankino Tower the tallest building in the world?
8. When was Wembley stadium opened?
9.Where did the name 'Colosseum' come from?
10. How tall is Stonehenge? Why was it built for?
11. How tall is St Paul's Cathedral and how many steps are you to walk to the dome?
You are to post your answers to my email alftimartmir@yahoo.com.au