Because it is a flat drawing trying to represent the Earth, which is a curved surface and there is distortion.
The most accurate map is the best map.
It is a 2 dimensional map
Mercator.
The Globe
The globe
You can view an accurate map of Cleveland on sites such as Busted Maps, City Search, government websites NCDOT and USGS, Map Quest, and even Google Maps.
graphic
the sailing around the world map
the circular shape that a map can not
You can get a accurate map at the following web sites I found online for you to look at vision.eecs.ucf.edu/.../WhereAmI/ProjectPage-WhereAmI.htm ,www.tripadvisor.com/ShowTopic-g294226-i7220-k5513878-
cica
make it accurate