Yes, the Towers - they do viewings, but only the first 500 or so (can't remember the exact figure) are allowed in each day, so get there early - fantastic buildings. Also, for those who are fans of views, then the Sky Tower, not far from Petronas towers, also allow access up, and actually goes higher than the viewing platform on Floor 44 of the Towers. Chinatown is great for cheap food, night markets. Easy to get around on the underground - check how clean it is too (compared to the tube in London!). It is a great city - a good mix of old and new. The Batu caves, just out of town house an old temple I think, accessed by climbing hundreds of stairs - great for the calf muscles and great views from up there too. Beware the monkeys running about, one ran off with my friend's bag and was very violent when trying to get it back!! There's also some great museums, parks and architecture. ENJOY!!!