This link gives you access to many of the records about immigrants coming to New York before Ellis Island was opened in 1892. You can possibly even trace your ancestors through this website. Castle Garden was important for immigration because it was the first official immigration center in America. This location is currently at the tip of Manhattan in New York.
This link gives you access to many immigrant records after 1892. This port has always been famous around the world because one of the first things you see coming into the port is the Statue of Liberty. This website also allows you to see photographs and names of ships in the Ellis Island port. Lastly, the site provides everyone with a timeline of the past history of the port.