Start out with inexpensive tiles, about 4"x4", which you can get from any hardware store and should be less than $.20 each (here's an option). Ceramic is going to be the most affordable, and you'll have a few options for color, though I'd recommend white or cream. Lay out the coasters on top of the map in the area you'd like to represent. Trim the map using an x-acto knife (be sure to have something protective underneath!) and make sure it fits your coasters well.
To start, I would score/sand the tile, to make a more textured surface and ensure better attachment for the map. Then, I'd spread a layer of mod podge on the tile (I get my mod podge at Michael's, make sure to bring a 40% off coupon!). Lay the map on top, and adjust to the perfect fit. You should have a few minutes to get the placement right while the mod podge is still tacky. Apply a thin layer of mod podge to the top of the map as well, and allow to dry thoroughly.
I like a coat of polyurethane over this, to ensure the coaster is completely waterproof and protected. Do multiple thin layers of polyurethane, and allow each application to dry. Make sure you're coating the edges of the coaster as well, to be sure the corners of the map are secured.
Maybe the most interesting set was D's, which showcases the national mall in D.C. in one long line. I couldn't get all of them to fit in a frame, but you get the idea.
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how you like dem apples?