  Deep imaging, that is imaging capable of capturing very low surface
brightness extended objects, is a quickly growing field of extragalactic
astronomy. Not only can new types of faint objects be discovered, but deep
images of bright galaxies are very valuable, too, since they reveal faint signs
of past galaxy collisions, the tidal features. Such "archeological" record can
be exploited for investigating how galaxies formed. In the MATLAS survey, we
obtained extremely deep images of 177 nearby massive elliptical and lenticular
galaxies using the 3.5m Canada-France-Hawaii Telescope. In our contribution, we
will present the various types of objects and features seen in our images, for
example tidal features, faint star-forming regions in otherwise quenched
galaxies, or faint dust clouds in our own Galaxy. Finally, we will introduce
the deep-imaging efforts at the Milankovi\'c Telescope.
