Built in the 1200s, this is Prague's oldest Gothic structure. It houses the National Gallery's collection of 19th-century Czech art. If you can't make it during gallery hours, try to attend one of the almost nightly chamber concerts that are offered in the warmer months. They usually focus on Czech composers. Tuesday-Sunday 10 am-6 pm. 150 Kc adults. U Milosrdnych 17 (1), Prague. Phone 224-810-628. http://www.ngprague.cz/4/detail/convent-of-st-agnes-of-bohemia.