The third day in chicago

Today, I went to museum of art institute of chicago by red line to monroe station.
AP"Park boulevard" is outside white sox baseball stadium.
At exit in Monroe station, there are four aps. Then I went to E. Monroe then wabash Ave, congress street then turn left to michigan ave. then arrive at museum of art institute of chicago.
Along the route, my ipod touch always can detect wifi ap but mostly need wep, wap or username/password.
I found some login page
1.https://wirelesslogon.depaul.edu/__extraweb__authenid=qUmEXF5nGQQ%3D&alias=workplace&resource=%2Fworkplace%2Faccess%2Fhoe&realm=144&nodeID=sslvpn-cst-bs-a

2. IP3 NetAccess

3.iBAHN High-Speed Internet Access
https://secure34.ibahn.com/purchase/purchase?MA=00-22-41-b6-68-ee&SC=CHIRH&DI=168561951&PN=1&BD=57ca2d5e&PX=false

4Meru Networks
https://wlan-controller.admin.colum.ed:8081/vpn/loginformWebAuth.html

Until now, I still don't see any main wifi provider in chicago, such as BT in London, WiFly in Taipei and PCCW in Hong Kong.
The number of wifi aps is far fewer than the three cities.