My tweaked version of the Marauder's Map

 

Downscaled, obviously, with no attached origami (yet) and pre-paper ageing, but all in all, the final thing. Hand-sketched with a Lamy Safari pen and Urban Siena Atramentis ink. There are several differences with the real thing, but the main ones are:

-4 extra sections (to accommodate for zoom)

-Progressive zoom, i.e. all sections fit together and are arranged from larger zoom to the underground. 

-Added professor Sprout greenhouses and gardens, Owlery, Stone Circle ...

-Origamis include Boathouse, Hagrid's hut, Quidditch Pit and Gryffindor tower.