On 26 June 1976, Toronto's CN Tower officially opened to the public. Fifty years later, it remains one of the most recognisable structures on the planet, with a well-deserved place on the American Society of Civil Engineers' Seven Wonders of the Modern World list. At 553.3 metres tall, the tower was built to solve a growing problem. Toronto's skyline was expanding rapidly, and broadcasters were struggling with signal interference caused by the city's new high-rise buildings.

As pressure builds to reduce embodied carbon across infrastructure, attention is increasingly turning to how materials are sourced, specified and reused, and how sustainability can be embedded without compromising safety, durability or performance. The conversation is no longer just about lower-carbon materials, but also about circular use of materials already within the construction system. Challenging Perceptions Around Recycled Materials According to Dr Brody Clark, Senior

From water systems to roads and bridges, ancient civilisations were solving infrastructure challenges thousands of years ago, often with nothing more than basic tools, clever design and a deep understanding of their environment. What's even more impressive? Some of these assets are still in use today. Here are our top 10 ancient engineering projects that have well and truly stood the test of time. 1. The Cornalvo Dam, Spain Built in the 1st–2nd century CE, this Roman dam st