And when the wind is up , it 's also one of the most difficult .
Erin Hills , site of the 2017 U.S. Open and the 2011 U.S. Amateur , is undoubtedly one of America 's most stunning courses .
When the wind is up , it 's also one of the most difficult .
Erin Hills , site of the 2017 U.S. Open and the 2011 U.S. Amateur , is undoubtedly one of America 's most stunning courses .