Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Ħal Saflieni Hypogeum' has mentioned 'Limestone' in the following places:
Occurrence Sentence Text Source
Limestone doorways
The Hypogeum is constructed entirely underground and consists of three superimposed levels hewn into soft globigerina limestone, with its halls and chambers interconnected through a labyrinthine series of steps, lintels and doorways.
The plan of the Hypogeum itself is a series of three superimposed levels of chambers cut into soft globigerina limestone, using only chert, flint and obsidian tools and antlers.