Mysterious rock walls of Monument Coulee Different people have different takes on who built the rock walls in Monument Coulee and when, without carbon dating we may never know. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Leave a Reply Cancel reply Enter your comment here... Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. ( Log Out / Change ) You are commenting using your Twitter account. ( Log Out / Change ) You are commenting using your Facebook account. ( Log Out / Change ) Cancel Connecting to %s Notify me of new comments via email. Notify me of new posts via email. Δ This site uses Akismet to reduce spam. Learn how your comment data is processed.