20190714_133717 A narrow curving street in Vilnius Old Town
20190710_144003 Sculpture of Velnias in the Samogitian Sanctuary
He is portrayed here with horns, but according to Wikipedia, in the pre-Christian times he used to be portrayed as a black animal or bird (especially a crow / raven), and sometimes as a person. The horns seem to be a later addition from when Velnias became identical to Satan.
Samogitian Alka, or Samogitian sanctuary ("Žemaičių Alka") is a little pagan sanctuary in Lithuania, on the coast of the Baltic sea, north of the Šventoji town. It's situated on the small hill by the beach, on the other side of the dunes. You can see the sea from here, which, I suppose, makes it a perfect place for pagan rituals.
It consists of about a dozen wooden poles representing various ancient Baltic gods, carved by Lithuanian folk artists in the late 20th century.