The Old Town of Vilnius (Lithuanian: Vilniaus senamiestis), one of the largest surviving medieval old towns in Northern Europe, has an area of 3.59 square kilometres (887 acres). It encompasses 74 quarters, with 70 streets and lanes numbering 1487 buildings with a total floor area of 1,497,000 square meters. The oldest part of the Lithuanian capital of Vilnius, it has developed over the course of many centuries, and has been shaped by the city's history and a constantly changing cultural influence. It is a place where some of Europe's greatest architectural styles. (wikipedia.org)

on this subject: Vilnius historic centre (whc.unesco.org)