希腊雅典

查到資料說有效期四天：And once purchased, they are valid for four days. The ticket costs 12 Euros. This allows the holder entry to the Acropolis, and six other archaeological sites.
http://archaeology-travel.com/travel-tips/buying-tickets-for-the-acropolis-and-other-ancient-sites-in-athens/

规定四天，但是票上没有日期，旅行期间可以随时去。