Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Humayun's Tomb, Delhi' has mentioned 'World Heritage' in the following places:
Occurrence Sentence Text Source
[12][13] The tomb was declared a UNESCO World Heritage Site in 1993,[11] and since then has undergone extensive restoration work, which is complete.
The Tombs of Battashewala Complex lie in the buffer zone of the World Heritage Site of the Humayun Tomb Complex; the two complexes are separated by a small road but enclosed within their own separate compound wall
An important phase in the restoration of the complex began around 1993, when the monument was declared a World Heritage Site.