Disney started building Pop in 1999 and the Classic Years of Pop was not opened until late 2003.
The other half of Pop known as the Ledgendary Years remains unfinished to this day.
if you go to the back of the resort by the lake there is a bridge, go to the end of the bridge look across the lake you will see the bigest eyesore and waste of money in disney it is rest of pop the" legend years " its a legend alright.
This was published in June 2006 from this website:
http://www.mouseplanet.com/articles.php?art=eo060630bb
After the strong success of the All Star Resorts, it became clear to Disney management that more "value level" resort capacity at Walt Disney World would be a good investment. Having more inexpensive rooms on-site would bring more customers through the gates to stay for longer duration visits, rather than staying off site at the chain motels on the 192 and International Drive strips.
Construction for the new Pop Century Resort, began in late 1999 and continued at a steady, if not breakneck, pace for almost two years.
Located just South of Caribbean Beach Resort off of Victory Way, the new resort was expected to be the perfect place for sports teams to stay while competing at various tournaments at the nearby Wide World of Sports.
The influx of amateur softball and baseball teams, cheerleading and dance squads, and fans of the Atlanta Braves (who make Wide World of Sports their Spring training home base) would certainly fill this new resort's rooms as soon as it was built.
Then came the tragedy of 9/11. As our nation mourned the loss of heros and innocent civilians to the dastardly attacks on New York and Washington (not forgetting the patriots on the flight that "failed" it's mission when it crashed in Pennsylvania), going on vacation to visit Mickey Mouse became much less important. More families stayed home or took shorter, local trips for vacation in the two years or so that followed.
Without the need for the extra capacity, construction on the Pop Century Resort buildings was put on hold and the buildings were mothballed. It wasn't until late 2003, just in time for the Christmas holiday week in fact, that the Classic Years (depicting the 1950s, '60s, '70s, '80s, and '90s) half of the resort opened. The Legendary Years (depicting the decades from 1900 through 1940) remains incomplete and unopened with no published plans for completion.
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Here's a link to an article that talks about the unfinished section of Pop becoming suites:
It has photos of how the unfinished section of Pop looks today.