Museum
Signatories House (The House of Signatories)
2 locals recommend,
Location
26 Pilies g.
Vilnius, Vilniaus apskr.
Tips from locals
The whole Lithuanian struggle on breaking out of the Soviet dictatorship is told there. There is also the re-discovered declaration of Independence on display too. Part of the musuem is free, part is paid (~3-5 euros, if I remember correctly).