I've been working in Manhattan now for close to 15 years. And no matter how long I've been here and how much I've seen and experienced, one thing will always continue to give me the willies:
The sound of 65 stories of skyscraper above your head groaning and creaking as it sways in the wind while you're at your desk.
There's no sound in the world like it. You can hear the strain of the steel infrastructure in the walls as the high winds move the top of your office building (70 Pine street in my case) 5-10 feet side to side. As you sit in one of the tallest buildings in the world, graphically imagining how a building built in 1932, 40 years before you were born, could possibly crash thousands of tons of steel and concrete on your head, you get very little work done.