The phrase "fortress walls" refers to the protective outer walls surrounding a fortress or castle. It symbolizes strength, security, and defense from enemies. Full definition
If you visit this country some day you need to visit the amazing fortress walls, walk around the cutest streetsm visit the cathedral and I always recomend the train tour by the city. (modacapital-blog.com)
Initially built in 1588, today it's home to great shopping and dining options, providing visitors with the opportunity to grab a bite and stroll around and explore the fort, the cathedral or check out the seaside fortress walls. (lapointcamps.com)
This is a mesmerising 45 minute film projected onto the citadel's huge fortress walls. (thetravelmagazine.net)