Hanoi Circuit Pit Building. This incredible permanent structure forms the heart of the brand new Hanoi Circuit and is a 300m long, 3-story structure that overlooks the starting grid. Its stunning design has been inspired by Hanoi's famous Imperial Citadel of Thang Long as well as the Pavilion of the Constellation of Literature – the symbol of Hanoi.Hanoi Circuit Pit Building. This incredible permanent structure forms the heart of the brand new Hanoi Circuit and is a 300m long, 3-story structure that overlooks the starting grid. Its stunning design has been inspired by Hanoi's famous Imperial Citadel of Thang Long as well as the Pavilion of the Constellation of Literature – the symbol of Hanoi.Hanoi Circuit Pit Building. This incredible permanent structure forms the heart of the brand new Hanoi Circuit and is a 300m long, 3-story structure that overlooks the starting grid. Its stunning design has been inspired by Hanoi's famous Imperial Citadel of Thang Long as well as the Pavilion of the Constellation of Literature – the symbol of Hanoi.Hanoi Circuit Pit Building. This incredible permanent structure forms the heart of the brand new Hanoi Circuit and is a 300m long, 3-story structure that overlooks the starting grid. Its stunning design has been inspired by Hanoi's famous Imperial Citadel of Thang Long as well as the Pavilion of the Constellation of Literature – the symbol of Hanoi.