Out-of-town must, if you have more than a couple of days in Prague. This fortified 18th century town was used by the Nazis as a "model Jewish town" - a transit camp for thousands. It's a strange, fascinating place, oddly empty though a good many people have lived there since the war. Good museum includes a film made to fool the Red Cross, showing happy smiling people. The few communist-style shops evoke that era too. Very well worth a visit.
About an hour's bus ride from Prague, you can get a bus from the Florenc bus terminal; www.pamatnik-terezin.cz
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