What kind of structure is the Calgary saddledome?

The Calgary Saddledome is a multi-purpose arena located in Calgary, Alberta, Canada. It is known for its distinctive saddle-shaped roof, which gives it a unique architectural profile. Opened in 1983, it primarily serves as the home of the NHL's Calgary Flames and hosts various events, including concerts and other sports. The arena's design includes a combination of concrete and steel, featuring a spacious interior that accommodates a large audience.