长城 (chángchéng) means "Great Wall" and most commonly refers to the Great Wall of China. It is a series of fortifications built across northern China over many centuries to protect against invasions. The term literally combines 长 (long) and 城 (wall/city).
我去年夏天终于去长城玩了一趟。
Wǒ qùnián xiàtiān zhōngyú qù Chángchéng wán le yī tàng.
Last summer I finally went on a trip to the Great Wall.
长城是中国最有名的历史建筑之一。
Chángchéng shì Zhōngguó zuì yǒumíng de lìshǐ jiànzhù zhī yī.
The Great Wall is one of the most famous historical structures in China.
从北京出发,大概两个小时就能到长城。
Cóng Běijīng chūfā, dàgài liǎng ge xiǎoshí jiù néng dào Chángchéng.
Starting from Beijing, you can reach the Great Wall in about two hours.