I found Alphatecture interesting because usually typography involves building forms and molding shapes to create the letter forms. However, with Alphatecture it is all about using what is already in your surroundings to find the forms in something that was not meant to resemble a letter. Peter Defty is well known for his execution in this process. He is a professional photographer based near Leeds, in the UK. He takes photos all around the world and creates different alphabets based on each city he has been to.
Google Maps Typography uses the same idea but approaches it a little differently by using an aerial view to find letters in natural land/ building formations. This particular alphabet was put together by Rhett Dashwood, he did it over the course of several months. Its a little hard to read, but it shows lots of creativity and persistence.