Salmons, eels, and other fish that exhibit remarkable homing instinct may live thousands of miles away from the place of their birth but when they are about to give birth of their own, they return to the place whence they came to spawn and close out their lives.
Set in the heart of man is eternity. We find today, at the Great Pyramids of Giza in Egypt or other ruins of ancient civilization, depictions of man's longing for eternal life, immortality, and an everlasting place of rest.
This is because our spirits have come from God and our "home" to which we are to return is heaven.

"He has made everything appropriate in its time He has also set eternity in their heart" (Ecclesiastes 3:11a).
~ from Rev. Dr. Jaerock Lee's column "The Way" carried on The Seoul Newspaper