On the Washington state side of the Columbia river, there exists a memorial first dedicated to military people killed in WW1 from the area. The creator of the memorial decided to duplicate Stonehenge in its size and orientation, but complete. The memorial is not far from Maryhill winery, so we visited. It seems to be built of concrete, rather than discrete blocks. Here are some pictures:
For comparison, here is the original Stonehenge, on the UK Salisbury plain, from our visit in 2009. My hair has since gone white!