IMMIGRATION SITES:

This is the one where you can look up your ancestors.

http://www.ellisisland.org/

http://www.history.ohio-state.edu/projects/Immigration/AmericansintheRaw/

http://www.history.ohio-state.edu/projects/Immigration/CharacterofImmigration/

http://www.historychannel.com/ellisisland/index2.html

http://www.nps.gov/stli/serv02.htm

This one is really good

http://www.capital.net/~alta/index.html

TENEMENT HOUSING:

http://www.tenement.org/story.html

http://140.190.128.190/history/gould.html

http://www.mcny.org/fact4.htm

http://www.nycenet.edu/csd1/museums/confino/text/limner.html

This one is interesting.

http://www.upress.umn.edu/sles/Chapter2/ch2-6.html

http://www.thing.net/~lina/tenement2.html

MASS TRANSIT HISTORY:

http://www.fta.dot.gov/transcity/trans/mtcahistory.html

http://www.chicago-l.org/

http://www.mbta.com/text-only/profile/history/index.cfm

http://www.nycsubway.org/mus/

http://www.quuxuum.org/~joekor/

EARLY URBAN RECREATION:
http://www.centralpark.org/home.html