Image 1 Caption: "This image shows the entire Large Magellanic Cloud (LMC), with some of the brightest astronomical objects marked. The field of view (FOV) is ∼ 10° across and the directions of the equatorial coordinate system are indicated. The field of the new MPG/ESO 2.2-meter telescope image is indicated with a square outline." (Somewhat edited.)
Features:
Actually, the LMC can also be considered the prototype of the rather specialized galaxy type the Magellanic spiral galaxies which have only 1 spiral arm.
Why were the Sagittarius Dwarf Spheroidal Galaxy and Canis Major Dwarf Galaxy discovered so late in history? They are both small, faint, and in the case of the Sagittarius Dwarf Spheroidal Galaxy, somewhat aligned with the Milky Way disk, and so partly obscured by the interstellar dust in the Milky Way disk (see Wikipedia: Sagittarius Dwarf Spheroidal Galaxy: Features).