The Tunnels Under Our Feet: Colorado's Forgotten Hollow Sidewalks

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The book delves into the intriguing mystery of Colorado's hollow sidewalks, revealing the author's five-year exploration filled with entertaining and educational insights. It highlights the unique features of these sidewalks, particularly the manhole covers adorned with small glass discs, some of which have aged to a striking purple hue. This exploration uncovers a hidden aspect of urban design and history, inviting readers to appreciate the charm and secrets of their surroundings.