Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Durham Castle and Cathedral' has mentioned 'Tours' in the following places:
Occurrence Sentence Text Source
Designated as a cultural World Heritage Site in England, along with Durham Cathedral, since 1986, the facility is open to the general public to visit, but only through guided tours, since it is in use as a working building and is home to over 100 students.