Trakai
Trakų Pusiasalio pilis
Trakai Peninsula Castle
Free on the last Sunday of the month
A late-14th c. defensive castle built by Vytautas the Great; grounds open for walks, with the Sacred Art Exposition in a surviving building.
Kęstučio g. 4, Trakai,
trakaimuziejus.lt/en/ekspozicijos/