I could see a lot of nice looking small things when I visited churches of Vilnius. They were not at all off the beaten path but rather "off the beaten sight".
I liked some highly decorated old candlesticks esp. wooden, brass and/or silver-plated, flowers, liturgical vessels and vestments, small statues etc. But I rather didn't like pictures of saints hang in churches which were not of great artistic value and always looked somehat kitschy for me.
Although you won't be permitted inside (most likely), unless something will change, there are dungeons beyond Vilnius. They are unexplored and according to some hypotheses they are beyond all Vilnius downtown. The only known entrance is beyond altair of the church of Holy Spirit and priest one time a year goes down to bless people dead in those dongeons.
There are many bosies there, some are mummified (because of dry air there). Dungeons were closed and sealed in mid XIX century, but opened again in early XX century (?), although there are no documents about them because those were the times Poland ruled Vilnius. Students then explored dungeons and removed brick walls from crypts, probably then electricity was also installed. However, works were quickly forbidden after some strange crypt was found with supposedly victims of plague there. In Russian/Soviet occupation, it was planned to open museum of inquisition in dungeons, but it never happened (there was no inquisition in Vilnius actually).
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