Use the Internet Archive to browse through 85 billion archived web pages as far back as 1996. To start surfing the Wayback Machine, type in the web address of a site or page where you would like to start, and then press the Take Me Back key. You will then be taken to the available archived dates. Curious about what the Milwaukee Public Library's first webpage looked like? Here is the archived 1998 MPL homepage from the Internet Archive's Wayback Machine.
For other interesting sites on historical subjects, check out the History Category on the MPL homepage under Recommended Links.