This classic visualisation by Chris Harrison shows 63,779 cross references within the Bible as coloured arcs. The bar chart at the bottom shows the number of verses in each chapter (the lengthy 119th Psalm stands out visibly).
Cross references are visible at several different scales. For example, a spray of yellow arcs terminating at the lower right marks the numerous Old-Testament references in the book of Hebrews. This diagram won an honourable mention in the 2008 International Science and Engineering Visualization Challenge.