My kids want another shot at climbing to the top of the Eiffel Tower (as far as you are allowed) because 5 years ago it rained and they closed the stairs and we only made it to the second level! I was planning on pre-ordering tix online but the website says "stair entrance tix not sold online." Can anyone clarify this? If I pre-order will we only have access via elevator or will we have the option to take the stairs? Thank you!