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.

Hanging gracefully at the entrance to San Francisco Bay, the Golden Gate Bridge is more than a postcard icon. Completed in 1937, it was, at the time, the longest and tallest suspension bridge in the world, and a bold engineering statement built against wind, water, fog and financial uncertainty. Designed by chief engineer Joseph Strauss, with key contributions from structural engineer Charles Ellis and architect Irving Morrow, the bridge spans 2,737 metres, with a main span

Straddling the Paraná River between Brazil and Paraguay, Itaipu Dam is one of the most impressive feats of civil engineering ever built. Completed in 1984, it was recognised by the American Society of Civil Engineers as one of the Seven Wonders of the Modern World – and for good reason. For decades, Itaipu held the title of the world’s largest hydroelectric power plant by energy output. Even today, it remains a benchmark for scale, coordination and long-term infrastructure th