Thracian sanctuary the Womb Cave (aka “Cave Vulva”) dated XI-X century BC is located near village of Nenkovo, Kardjali region, Bualgaria. It was discovered in 2001. The temple is shaped like the opening to a vagina. It leads into a cave deep about 22 m. and wide 2.5 m. A human hand shaped it into a place of conception constantly washed by water seeping through the walls.
At the deep far end of the cave, a carved altar (1.3 in height) symbolises the womb itself.
At midday as the sun approaches its highest point in the sky, its light seeps into the cave through a special opening in the ceiling and projects a perfectly recognisable representation of a phallus onto the floor. As the sun progresses further, and the light slants across the interior of the cave, the phallus grows longer, reaching out to the womb altar. In the end of February or the beginning of March, when the sun is lowest on the horizon, the phallus becomes long enough to reach the altar and symbolically fecundate the womb.

(Fuente: aquariandawn, vía sylvainforfait)