Walking on air: The most mind-blowing glass floor skywalks in the world

After a $38 million face-lift, the first floor of the Eiffel Tower is now made of glass! Millions of visitors who flock to the landmark each year can look down through the tower’s central void to the ground about 200 feet below. To make things even scarier, the glass safety barriers around the edge incline outward. In honor of the Eiffel Tower's new look, here are the scariest glass-bottomed attractions around the world. Read more.