Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Cologne Cathedral' has mentioned 'Landmark' in the following places:
Occurrence Sentence Text Source
[5] It is Germany's most visited landmark, attracting an average of 20,000 people a day.
This work ceased in 1473, leaving the south tower complete to the belfry level and crowned with a huge crane that remained in place as a landmark of the Cologne skyline for 400 years.
The twin spires were an easily recognizable navigational landmark for Allied aircraft bombing.