Antonov An-225 Mriya is the biggest aircraft in the world. It was completed in 1988
Three Gorges Dam is world’s biggest dam. It was located at Sandouping in China.
Rafflesia is the biggest flower in the world.
Gotthard Base Tunnel is world’s longest tunnel in the world. It was located in Switzerland. It was opened on 1st june 2016 and service began on 11th December 16.