Steven,
You have probably seen the thread about ACO 3627 entitled "Why is the Norma Cluster not in Norma?"
It is definitely an object of mystery, visually quite unassuming due to high extinction, but comparable in its properties to the Coma Cluster of galaxies. The brightest three or four galaxies are quite prominent, but everything else is much much fainter.
The galaxy fields to the south and east of this cluster extend for a long way (all the way to Pavo), and are part of the same supergalactic structure (seen in part of this map by Anthony Fairall);
See also: "A Catalogue of Galaxies behind the southern Milky Way", (2001, Astronomy and Astrophysics, vol. 380, p.441, by Woudt and Kraan-Korteweg.)
This paper has got some really cool maps showing how inhomogeneous is the sky distribution of galaxies in the southern sky.....due to various large-scale structures.