Tourists on the bus tour of Marshall Space Flight Center from the U.S. Space &amp; Rocket Center step off the bus as the National Historic Landmark Redstone Test Stand.  Walking on the grass is prohibited.
<a href="//commons.wikimedia.org/wiki/User:Ke4roh" title="User:Ke4roh">James E. Scarborough</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>