The USA's tallest freestanding observatory soars 1,149 feet (350 meters) over the STRAT casino resort, and besides impressive views over Sin City and the surrounding area, it's also home to the Top of the World cafeteria and four thrill rides, including the world's second highest, the "Big Shot," a car which catapults riders up and down part of the tower, creating a gut-wrenching four g's of force (probably best not to have lunch immediately beforehand!).

Read more in Tripatini member Jeff Jeremy's post How to Spend a Great Day & Night in Las Vegas.