Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Historic Ensemble of the Potala Palace, Lhasa' has mentioned 'Fortress' in the following places:
Occurrence Sentence Text Source
Fortress in Lhasa, Tibet
The Potala Palace is a dzong fortress in the city of Lhasa, Tibet Autonomous Region, China.
[3] It may overlay the remains of an earlier fortress called the White or Red Palace on the site,[4] built by Songtsen Gampo in 637.
Built at an altitude of 3,700xc2xa0m (12,100xc2xa0ft), on the side of Ri Marpo ('Red Mountain') in the centre of Lhasa Valley,[25] the Potala Palace, with its vast inward-sloping walls broken only in the upper parts by straight rows of many windows, and its flat roofs at various levels, is not unlike a fortress in appearance.