Despite the Western view that "kremlin" is a word solely associated with Moscow, the word translates as fortresss. Centuries ago, all Russian cities had a central, walled kremlin.
The ruined citadel of Koshoy Korgon, is located just outside of the village of Kara-Suu. Not much is known about this fortress (at least according to my guidebooks, anyway) but it dates from roughly the 10th century, and was probably Karakhanid.
Theresienstadt concentration camp (often referred to as Terezín) was a Nazi concentration camp during World War II. It was established by the Gestapo in the fortress and garrison city of Terezín, located in what is now the Czech Republic.
Tash Rabat is a stone fortress/caravanserai dating from either the 13th or 15th century (depending on the source), which was once a prominent stop on the silk road. Tash Rabat is only about 60km from the city of Naryn; however, due to the quality of the roads, the trip takes about two and a half hours.
National Cemetery where 10,000 victims are buried, including 2,386 in individual graves