Introduction to Stratosphere Tower: The Stratosphere Tower is on the Strip, 1,149 feet high, approximately 108 stories high, and is the tallest free observation tower in the United States. It is also the tallest building west of the Mississippi River. The tower has a revolving restaurant, indoor and outdoor observation decks, theme restaurants, shopping malls, and the world's tallest roller coaster called the High Roller. Climbing the tower and looking into the distance, you can have a panoramic view of the entire Las Vegas. Especially at night, the entire casino is brilliantly lit and extremely beautiful.