CD Projekt RED has hidden a cool easter egg in the Blood and Wine expansion for The Witcher 3, but it’s only accessible using mods. YouTube user pippo311lp used a free-roaming camera mod to explore a normally inaccessible mountaintop, where he found a little surprise from the development team waiting.
The team inserted a little photograph of themselves on an easel between two pillars atop the mountain for any inquisitive players to find. You can find it for yourself by using this camera mod. The easel itself will only show you the photograph if you use Geralt’s Witcher senses, by the way.