Composite image of Mercury.
Mercury is the closest planet to the sun, ranging from 29-43 million miles away, and is the eighth largest with a diameter of 3000 miles. These distances are scaled for NWISSM as described here. More information about the real Mercury can be found on the web at links such as this. For example, a "day" on Mercury is two "years" long. (I.e., It rotates 3 times for every 2 revolutions around the sun.) This gives rise to some of the most extreme temperature variations in the solar system on its surface.
The NWISSM-Mercury cache is located within a short walk of a state historical monument which you may want to visit. You'll have to move a short distance up the street to catch a glimpse of NWISSM-Sol through the trees. How'd you like to be that close to the sun!