Vilnius, Lithuania's capital, is vying to become a tech hub.Westend61/Getty ImagesLithuania's startup scene is booming, with over 900 startups, and it's transforming Vilnius.Unicorns Vinted and Nord Security are based around Vilnius' Cyber City, a former factory site.Tech Zity, on another old factory site, is now set to become Europe's largest tech campus.In a cluster of industrial buildings on the outskirts of Vilnius Old Town, a series of grey-brown brick buildings tower over their surroundings.A tall chimney stack is a lone relic from the site's time as a Soviet sock factory.