Occurrence of Attributes in Original Text

The text related to the cultural heritage 'The Jantar Mantar, Jaipur' has mentioned 'National monument' in the following places:
Occurrence Sentence Text Source
[2] Restored again several times during the British colonial rule, particularly in 1902, the Jantar Mantar was declared a national monument in 1948.
Jantar Mantar is managed under the Archeological Sites and Monuments Act of Rajasthan since 1961, and protected as a National Monument of Rajasthan since 1968.