The Great Wall of Qi is the oldest stone-built wall in China.

The Beijing city fortifications represent the historical city defense systems that protected Beijing, the capital city in China.

Jinshanling is a section of the Great Wall of China located in the mountainous area in Luanping County.

The Great Wall of China at Huanghuacheng is a remarkable section that runs through a picturesque landscape.

Buyeo Naseong, or the City Wall of Buyeo, provided protection for the capital of the Baekje Kingdom.

Fortress Wall of Seoul, an ancient wall considered as the historic sites in South Korea.

The Quzhou city walls are a majestic example of ancient Chinese fortifications.

The fortifications of Xi'an, an ancient capital of China, represent one of the oldest and best preserved Chinese city walls.