Karlovy Vary is once in the year - in Juni - the town of the Movies - Film Festival in Karlovy Vary which visits many actors from different countries - it take place in Hotel Thermal.
The New Synogogue was built in the Romantic Moor-Romanesque style in 1892 and is a testimonial to the rich Jewish community that thrives in Plzen prior to Nazi invasion.
Daily at noon once or twice a week for about 5 minutes the "emergency siren" test sounds across Plzen. It is a bit eerie and made me a little bit nervous the first time I heard it. It fuels the urge to hide, be safe, and hit the shelter.
The tram (as well as buses and trolley buses) is a relatively quiet place broken by the ocassional sound of a crying baby. People usually do not read papers or books, quite in contrast to the public transport in Prague. People generally stare out windows or at the tv screens in some of the new buses. Loud obnoxious behaviour is frowned upon.
If an elderly or handicapped person gets on and you're sitting but well able to stand, it is courteous to offer your seat.
If you have on your huge world traversing backpack, take it off and hold it close to you on the floor. No one wants to compete with the space it takes up.