Abell 2151 The Hercules Cluster (Abell 2151) is a cluster of about 200 galaxies some 500 million light-years distant in the constellation Hercules. It is rich in spiral galaxies and shows many interacting galaxies. The cluster is part of the larger Hercules Supercluster, which is itself part of the much larger Great Wall super-structure. (wiki)
In the picture above you see the Abell 2151 wide field (north is to the left) and for interest I have here also marked (near the center bottom) rather bright quasar with redshift z=3.88 (light travel time > 12 billion light-years).

And yet another (enlarged) view on the cluster core, with relatively well resolved Arp's 272, 71 and 122. The last Arp, 172, is also marked in the upper picture.

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