Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Capital Cities and Tombs of the Ancient Koguryo Kingdom' has mentioned 'Stone' in the following places:
Occurrence Sentence Text Source
Some of the tombs have elaborate ceilings designed to roof wide spaces without columns and carry the heavy load of a stone or earth tumulus (mound) was placed above them.
Surrounded by a defensive wall with three gates which was partly built in stone and in other places exploited the cliff face, the city included a palace, military camp, watch tower, houses and warehouses.
Guonei City played the role of a supporting capital after the main Koguryo capital moved to Pyongyang; it is one of the few plains city sites with stone city walls still standing.
The 12 imperial tombs take a stepped pyramid form constructed of stone.
The tombs of the nobles have stone chambers covered with earth mounds and are decorated with wall paintings, depicting scenes of daily life, sports, hunting, nature, gods, fairies, and dragons.