Other major projects include the renovation of, and addition to, the headquarters of the United Nations, completed in 2014,[44] the restoration of the World Trade Center site including the removal of debris, the reconstruction of the Port Authority Trans-Hudson and New York City Subway tunnels, and the creation of a World Trade Center Transportation Hub, completed in 2015[45][46][47][48] (including the "Oculus" station entrance designed by Santiago Calatrava),[49][50] the Second Avenue Subway tunneling project completed in 2016[51] and Moynihan Train Hall completed in 2020.[52]