Well, much of the architecture there is the same as here. I had a tour there a year ago. The common culture of yesteryear should lead to common ties but the tour guide did tell us that they have been trying to forge a kind of 'Lithuanianness' if you will.
Yes I've also heard that... They like to promote their pagan roots because most of them see the PLC period in a bad light (slow dissapearance of Lithuanian culture, being de facto controlled by the stronger partner in the union (or even Polish occupation in the POV of some) etc.)
Actually most of today's Lithuanians are de facto descendants of Samogitians and Aukshtotians rather than the original Lithuanians. Mainly because after the GDL (Grand duchy of Lithuania) swallowed the large areas of mainly Ruthenian orthodox lands from the former Kievan Rus it quickly get Ruthenised in the XV, XVI and XVII century - simply because the number of Lithuanians was far smaller than the population of the conquered lands. Later on after the union with Poland, Ruthenians and those Ruthenised Lithuanians have got Polonised in the XVIII and XIX century... And probably that's why there are even Poles there (I think that not many of them actually ever were ethnic Poles, but calling them Polonised Lithuanians is a big oversimplification and only the half of the truth) and why nowadays Lithuanians emphasize much on their culture - simply to retain their different culture and not being swallowed culturally (or in any other sense) by Russia or Poland.
Why should they have signs, btw? Why should they have street names in Polish? They are in Lithuania, not Poland, andrei. Should Albanians insist on Albanian street names in Kosovo after becoming the majority in parts? Is it theirs?
Ever been to Opole region and Kashubia in Poland or to Lusatia in Germany? The minorities there have a right to have bilingual signs:
in Opole - Polish and German
in Kashubia - Polish and Kashubian
in Lusatia - German and Sorbian.
I don't see why Polish minority should deserve a worse treatment, especially when they constitute the majority there... damn, in Poland we even have granted places in the parliament for national minorities (most often 1-2 seats).
Cannot use their Polish surnames? Well that is just wrong. They should be allowed to.
But they cannot... their surnames have to be 100% in tune with the rules of Lithuanian langauge (with their alphabet and weird endings added to surnames like: -us -as and the likes).
I almost felt like I was in Poland when in Vilnius and Kaunas. The old traditions should be honoured and there is little logic to Lithuania being so harsh against Poles. Maybe they felt bad after the Polish-Lithuanian Commonwealth but I can't fathom why.
Well... the traditions of Poland and Lithuania are quite close to each other because of obvious reasons (we both were in one state for a long period of time).
The PLC is one thing which they feel bad about... but the main reason is probably our collateral relations in the XX century, especially before WW2.