Many famous games such as Zelda use this concept.
A common problem for tile based game is the map creation.
We often are limited in terms of size. But I found a way around this issue.
I use a combination of map comression with the Run-Length alogrithm, copyPixel and Blitting to display a huge map.
Try it yourself ! Click Here
(Please scroll the map with your mouse and try to reach the edge of this gigantic map of 500.000 tiles.)