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The Leo Cluster (Abell 1367) is a galaxy cluster about 330 million light-years distant (z = 0.022[1]) in the constellation Leo, with at least 70 major galaxies. Along with the Coma Cluster, it is one of the two major clusters comprising the Coma Supercluster. Along with being a part of the Coma Supercluster, that with many others, helps form the Great Wall, which is hundreds of millions years long and is one of the largest structures in the universe. Leo has many galaxies, galaxy clusters and quasars; but lacks nebulae, planetaries, or star clusters.
http://www.slate.com/blogs/bad_astronomy/2013/07/03/leo_cluster_a_buzzing_hive_of_galaxies.html
http://www.cloudynights.com/page/articles/cat/column/small-wonders/small-wonders-leo-r486