I was a senior at Wagner College on Staten Island, NY, right across the river from lower Manhattan. Wagner is on Grymes Hill, which is a really high hill on the north shore of the borough. From my dorm room (Harbor View it's called, which is 14 stories tall) you can see into Brooklyn and lower Manhattan.
I woke up at 7 am, though my classes didn't start until 11:30. My nose was stuffy, so I couldn't go back to sleep. I got up and started browsing the internet. My neighbor was blasting the radio at the time the first plane hit, though I couldn't hear what it was saying. I ignored it, figuring if it was important enough I would find out what it was later. My roommate's girlfriend called him and told him to turn on the news. We did and saw the first plane had hit.
Our room faced the campus, but if we went out into the 12th-floor lounge (we lived on the 12th floor) we could see the view into Manhattan. We went and saw the smoke. Like everyone else, we thought it was an accident. We went back into our room and kept the news on in the background. Then the second plane hit. At that point, we knew it wasn't an accident. We weren't watching at that very moment, but once we saw it, went back into the lounge, only to see even MORE smoke. I immediately thought that I was in a tall building, so I had to get out of there.
Once I reached ground level, I started talking to a friend, and I could've SWORN that I felt the ground shake a little.
I went to the Hawk's Nest, the diner on campus, where they had a TV at that time. Before I reach there, my roommate's girlfriend was at the front desk working. She told me the first building fell. That put that ground shake feeling I felt in perspective.
Once the second building fell, they canceled classes for the rest of the day and the rest of the week. I chose to stay on campus, though I lived less than a mile away and could've gone home. I called my father, who worked at Newark Airport. I couldn't get through to him, as the phone lines were entirely jammed. The internet was also jammed and I couldn't go to any news sites that I tried. I am very fortunate that I didn't know anyone directly that died in those buildings.
The whole day felt like a movie. It did not feel real. I've been to so many memorials since I live so close to Manhattan. Such a crazy time to be around NYC.
Oh and BTW, my roommate had to go to class before it all went down, and it was a drawing class. The teacher took the class to the 10th floor of my dorm, and HAD EVERYONE DRAW THE TWIN TOWERS!!! Once the buildings fell, they packed up and left. CRAZY!