anniversary, very -- it's a totally different feeling. >> no doubt about that. that picture says it all. the two beams of light. where the twin towers were. look at that magnificent, new, world trade center building lit up in red, white, and blue. not completely finished yet. just about finished. getting very close. a magnificent building. >> it's going to be the tallest in the united states. >> tallest building in the united states. that's right. even taller than the building, still sears tower in chicago. i know you know chicago. >> hancock building. >> there you go. >> we can call it the sears. >> the willis. >> what you talking about, willis. >> used to be the second largest, the hancock, the willis. call it sears tower. >> let's just move on. all right. there is still no sign of a breakthrough in chicago. teachers strike enters day three at 350,000 students remaining out of the classroom. the union president says they're miles apart from reaching any agreements. more from abc's alex perez. >> reporter: union teachers