Adam Clarke on Psalms 78:69

He built his sanctuary like high palaces - כמו רמים kemo ramim, which several of the Versions understand of the monoceros or rhinoceros. The temple of God at Jerusalem was the only one in the land, and stood as prominent on Mount Zion as the horn of the unicorn or rhinoceros does upon his snout. And there he established his ark, to go no more out as long as the temple should last. Before this time it was frequently in a migratory state, not only in the wilderness, but afterwards in the promised land. See the notes on Psa 78:60 (note).