A total of 3,686 historical monuments and archaeological sites have been declared protected as that of national importance by the Archaeological Survey of India (ASI).
Replying to questions, Sharma said ASI has declared all the monuments and archaeological sites protected by it as polythene free zones.
The Culture Ministry has written letters to all chief secretaries of states for their active cooperation in making centrally protected monuments as polythene free zone, he said.
"All the field offices of ASI have been directed for necessary compliance," the minister added.
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Till November 15 of the current fiscal, as much as Rs 191.50 crore has been spent on conservation of all centrally protected monuments/sites of national importance, Sharma said.
To a query about Rakhi Garhi, a site located in Haryana, Sharma said the government has set up a committee to look into the issues related to Rakhi Garhi, which is considered as a historically important site of the civilisation.
Rakhi Garhi is believed to a settlement that came up before the Indus Valley civilisation.