By train or by bus from Vilnius. It takes from 30 to 45 minutes.
Trakai Castle Museum, Kestucio st. 4, ☎ +370 528 53 941 (firstname.lastname@example.org), . 10:00-19:00. Reconstructed residence of Lithuanian dukes in 14th century. Most famous castle in Lithuania, probably symbol of medieval Lithuania itself. Many concerts and plays during summer season.12 LTL.