We stayed in a hotel that overlooks that 9/11 Memorial in late August. We spent some quality time in and around the Memorial over three days.
The new Tower One is up. Towers Three and Four are up and not yet finished. The base for Tower Two is there and there is a lot of construction activity in and around the World Trade Center site.
People from around the world visit the 9/11 Memorial to pay their respects. The overall mood was very respectful and positive.
The New York financial district has largely recovered. Fabulous new waterfront parks and condos abound; but here and there there you see buildings that are closed off or still being renovated. Those buildings and the 9/11 Memorial itself stand as solemn reminders of the terror of 16 years ago.