Number + 座 + Adjective + 的 + 城堡
The noun 城堡 (chéngbǎo) means 'castle' or 'fortress,' referring to a large fortified building or structure. It is used in both historical and fantastical contexts, and can be modified by adjectives or measure words like 座 to describe its size or appearance.
山上有一座古老的城堡。
Shān shàng yǒu yí zuò gǔlǎo de chéngbǎo.
There is an ancient castle on the mountain.
孩子们在沙滩上堆了一个小城堡。
Háizimen zài shātān shàng duī le yí gè xiǎo chéngbǎo.
The children built a small castle on the beach.
这座城堡已经有五百年的历史了。
Zhè zuò chéngbǎo yǐjīng yǒu wǔbǎi nián de lìshǐ le.
This castle already has five hundred years of history.