With people in two countries watching, a 93-year-old Michigan power plant out of service since 2001 has been imploded along the U.S.-Canadian border. The Marysville power plant, known as "Mighty Marysville," collapsed dramatically Saturday during a long-planned implosion in Marysville, 55 miles northeast of Detroit. It was known for its towering smokestacks. The site is along the St. Clair River, which separates Michigan and Ontario, Canada. Marysville opened in 1922.

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