ENBalts’ sacred places, the old common name of which is alkai, are one of the most interesting monument groups. They have not been properly protected or investigated for many years for various reasons: ideological, methodological, and financial. A sacred place is not only a hill or a stone. Usually they have their own names and are shrouded in place-legends and beliefs. Sometimes people still believe these sites bring happiness and health. They immortalise the contact between nature and culture, the history of gods and humans. So sacred places are one of the most amazing realia of prehistoric world and this monograph is intended for those who seek more knowledge about it. From the bottom of my heart I devote this monograph to the memory of the ancient Balts. Many of them perished in the whirlpools of historic events and religious changes, were scattered to faraway regions, or were forced to change their faith. The sacred places, their cult places, that are examined in this monograph have become shrouded in secrecy and buried in time [p. 1].