8. Chichen Itza Pyramid, Mexico

You might be surprised to see this one on the list because millions of tourists come to see the Chichen Itza Pyramid each year. However, even though you can visit it, people are not allowed to climb it. Until 2006, people were allowed to climb to the top, but a tragic accident caused them to close it to the public. 

The ancient Mayan pyramid has steps on either side, but they are corroded, which adds to the danger. Although you can't climb to the top, you can see this marvelous wonder from the ground. It's not exactly the same, but it is still breathtaking.