This is a cenotaph, known as the hill of crosses, in Jurgaičiai, Lithuania. It started in Medeival times to mark a grave with no body. Probably during some battle with the Russians, someone placed a cross on the hill to remember someone. Others copied. For certain, since 1831, people have come specifically to this hill to place cross and remember.
The Soviets have bulldozed all the crosses more than a few times. But the crosses keep coming back. Finally, the Soviets gave up.
