Messier 1, the Crab nebula, is the remnant of a supernova that exploded in the year 1054 CE. It is an expanding bubble of gas, one of the very few nebula whose evolution can be observed in the human-life timescale (see Adam Block’s amazing video at
https://vimeo.com/71117055).
It is relatively bright, which allowed me to image it even from a light-polluted Bortle 7 sky. Due to the sharp spectral emission lines this is an object that really shines (pun intended) in narrowband imaging, in this case I used a one-shot-color camera so this is a more traditional RGB image, but it still shows some filamentary structure (with all the limitations of my image scale, of course).
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