Location Map specific to (and zoomed to) Cape Cod, made specifically for the "WikiProject Massachusetts - Cape Cod and the Islands" on the English Wikipedia, but it is available to all.  
For detailed instructions and several examples showing the various ways to use this file, see the documentation page at en:Module:Location map/data/USA Cape Cod.
Specifications:

Equirectangular projection, N/S stretching 130.0 %.
Geographic limits of the map:
Northern boundary: 42.104054° N
Southern boundary: 41.488985° N
Western boundary: 70.844280° W
Eastern boundary: 69.778120° W
Map Center: 41.7965° N, 70.3115° W
Nominal image size: 560 × 420 pixels
1 px = .001905 degree longitude
1 px = .001464 degree latitude
Own work
Grolltech