You are not allowed to wear your favourite heels in Greece. It is not because they might hurt while walking but because of the damage they cause to the monuments.
The authorities in Greece launched a campaign against women wearing stilettos at the archaeological sites. They believe that wearing heels might damage the ancient monuments and thus, a number of ancient sites including the Odeon of Herodes Atticus, a stone theatre built in the year 161 A.D, do not allow visitors to wear high heels. The ban that came into effect in 2009 said, “Female visitors must wear shoes that do not wound the monuments. These monuments have a skin that suffers and people must realise that.”
Earlier, maintenance crews had also removed almost 60 pounds of chewing gum that was thrown under the marble seats of theater. The guidelines not only ban heels but also food and drinks from these sites.
So, if you are planning to visit Greece, heels should not be in your packing list.