At Newgrange in County Meath, Ireland there is a similar structure. The difference is that the inner chamber is fully illuminated at sunrise on the winter solstice. It is estimated to have been built around 3200 B.C.
Standing inside cannot help but impress you with the skill and technology of these primitive people. Not only moving and assembling the huge stones, but aligning them perfectly for the desired effect.
For those interested in Newgrange, here is some very detailed and interesting info:
Long version:
http://www.mythicalireland.com/astronomy/ancientastronomers.html
Abbreviated version:
http://www.mythicalireland.com/ancientsites/newgrange-facts/astronomy.php