Increasingly close collaboration between architects and engineers has caused an explosion in bridge design over the last few decades, resulting in structures that are both bold yet rational. As a result, cities have exploited bridges as great monuments of design, to foster pride in the residents and promote themselves as a destination for tourists. These ideas have inspired photographer Greig Cranna as he travels the world, capturing the elegance of today's bridge infrastructure.
Cranna has been documenting some of his stunning photography on Instagram, collating it over the past 20 months into a forthcoming book, Sky Architecture—The Transformative Magic of Today's Bridges. In capturing these entrancing structures, the photos show the impact of the bridges as an addition to the landscape and revel in their contemporary silhouettes and designs.