Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Speyer Cathedral' has mentioned 'Altar' in the following places:
Occurrence Sentence Text Source
The graves were placed in the central aisle in front of the altar.
The graves of the emperors and kings were originally placed in the central aisle in front of the altar.
The restored coffins were relocated into a newly constructed crypt open to the public under the main altar in 1906.