The Mars Yards built for the PERs vary in size, shape, terrain, materials, and complexity. More pictures can be found in the Gallery.

Smithsonian Air and Space Museum This yard is a scale model of real Martian terrain.	NASA Ames Mars Center This is the largest yard to date.
Exploratorium Sand mixed with paint gives this yard its texture.	National Science Center Twin yards shaped to maximize available space.
Robotics Institute 25th Anniversary A simple but effective yard.	NASA Ames traveling yard at Farnborough Air Show This yard can be packed in a suitcase.
2005 World Exposition The rocks and terrain in this yard were created from polystyrene.