纪念馆 (jìniànguǎn) means "memorial hall" or "memorial museum," a place dedicated to commemorating a significant person or event. It combines 纪念 (to commemorate) with 馆 (hall/building). For example, 国家纪念馆 means "national memorial."
我们参观了鲁迅纪念馆,了解了他的一生。
Wǒmen cānguān le Lǔ Xùn jìniànguǎn, liǎojiě le tā de yīshēng.
We visited the Lu Xun Memorial Hall and learned about his life.
这座纪念馆是为了纪念抗战英雄而建的。
Zhè zuò jìniànguǎn shì wèile jìniàn kàngzhàn yīngxióng ér jiàn de.
This memorial hall was built to commemorate the heroes of the War of Resistance.
纪念馆里陈列着许多珍贵的历史照片。
Jìniànguǎn lǐ chénliè zhe xǔduō zhēnguì de lìshǐ zhàopiàn.
Many precious historical photographs are displayed in the memorial hall.