The Roman Walls of Lugo are a UNESCO World Heritage Site located in the city of Lugo in the Galicia region of northwestern Spain. The walls were built in the late 3rd and early 4th centuries AD and were part of the Roman city of Lucus Augusti, which was an important center of trade and commerce in ancient times.

The walls of Lugo are unique in that they are the only complete example of Roman military fortifications in the world. The walls encircle the historic center of the city, stretching for over 2 kilometers and featuring 85 towers and 10 gates. They are built of granite blocks and rise to a height of up to 15 meters in some places.

The walls were built to protect the city from attacks by barbarian tribes and played an important role in the defense of the region for centuries. They were continuously occupied by military forces until the 19th century and have been remarkably well-preserved, despite centuries of use and neglect.

Today, the walls of Lugo are a popular tourist attraction and a symbol of the city's rich history and cultural heritage. Visitors can walk along the top of the walls, enjoying panoramic views of the city and the surrounding countryside. The walls are also illuminated at night, creating a dramatic and impressive sight that can be seen from miles away.

In recognition of their historical and cultural significance, the Roman Walls of Lugo were designated a UNESCO World Heritage Site in 2000. They are one of the most impressive examples of Roman engineering and architecture in the world and are a testament to the enduring legacy of the Roman Empire.