The Roja Sea-fishing Museum was opened in 1971. It reflects the life and work of fishermen. One of the exhibitions tells visitors about Krisjanis Valdemars' naval schools on the seaboard of Northern_
"Kaltenes kalvas" (Stonewalls)
Stone ridges formed in the bed of Baltic Ice Lake at the final stages of the last Ice Age. There are several stone ridges with their own names - Velna kalva, Karduskalva, Punu kalva, Krapsinkalva etc. The_