Sydney Opera House, Australia

Located in Sydney, Australia, the theater has become one of the city's majore landmarks. Built in 1973, it is one of the most distinguished buildings of the 20th century. The shape of the theater took inspiration from shells, creating a harmonious picture with famous nearby attractions like the Sydney Harbour Bridge. It hosts over 1,500 performances each year, making it one of the most popular and busiest theaters in the world. It became a UNESCO World Heritage Site on June 28, 2007.