Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Old Havana and its Fortification System' has mentioned 'Stone' in the following places:
Occurrence Sentence Text Source
The king of Spain arranged its construction on a big stone which was known by the name of El Morro.
The extensive network of defensive installations that was created between the 16th and 19thcenturies includes some of the oldest and largest stone fortifications now standing in the Americas.
The extensive network of defensive installations created between the 16th and 19th centuries includes some of the oldest and largest extant stone fortifications in the Americas, among them La Cabaxc3xb1a fortress on the east side of the narrow entrance canal to Havana Bay, Real Fuerza Castle on the west side, and Morro castle and La Punta castle guarding the entrance to the canal.