Maps!

Anonymous. Wallis's New Game of Wanderers in the Wilderness. 1818-47.

Before the Europeans really knew about South Americans. To them it was just one big wilderness. Shows how subjective maps can be. 

Anonymous. Mount for a Lady's Fan. 1788.

Richard Long. Africa Footprints. 1986.

Maps can provide social commentary as well. 

Michael Druks. Druksland Physical & Social. 1974.

I really enjoy this point of view. He is his own land/country/continent. Makes me think of what I would call myself if I were a land...

Kathy Prendergast. Lost. 1999

 Christian Nold. San Francisco Emotion Map. 2007

I found out there is a device called a Galvanic Skin Response sensor, and it measures your physiological responses to an environment. It would be interesting to get a hold of one of these and measure people's responses as they walk through the Islais Creek and Glen Canyon. Or show people old photographs of what the Islais Creek used to look like, and what it looks like now, and measure their emotional responses to this change.  An artist named Christian Nold has done this kind of "emotional mapping" in cities like Greenwich, Paris, and even San Francisco. I really enjoy this mapping point of view in that the connections that people have to their environments are so complex, and many times a person's memories of a place will form their attitude toward it as well.
http://www.sf.biomapping.net/