Every year since 1977 International Museum Day is organised worldwide around May 18

This day is an occasion to raise awareness on how important museums are in the development of society.

These recent years, International Museum Day has been experiencing its highest involution with almost 30,000 museums that organised activities in more than 100 countries.

In Tehran, a ceremony will be held to mark the IMD on Sunday 20 May in which representatives of many Iranian museums will attend.