See larger One of the most interesting aspects of Ijams’ recent expansion, in the Ross Quarry section, is a peculiar structure known as the Keyhole. Constructed during the industrial era for purposes unknown, it’s Knoxville’s modern stonehenge. Huge limestone blocks, left there decades ago, make this different from other nature walks.

Photo by David Luttrell

One of the most interesting aspects of Ijams’ recent expansion, in the Ross Quarry section, is a peculiar structure known as the Keyhole. Constructed during the industrial era for purposes unknown, it’s Knoxville’s modern stonehenge. Huge limestone blocks, left there decades ago, make this different from other nature walks.

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