By DEE-ANN DURBINDETROIT (AP) â¿¿ Why go to a crowded auto show when you can glimpse dozens of new models on the internet? Because you can't catch a whiff of that new car smell through your iPhone. Photos can't re-create the smell of leather seats or the smooth feel of a hood. At this year's North American International Auto Show in Detroit, which opens to the public Jan. 19, visitors can see 500 cars and trucks spread over 18 carpeted acres. At least 800,000 people are expected to take in all the shiny models, amid the bright lights and thumping mood music. The biggest draw will be the first new Corvette in nine years. Technology lovers can see an experimental concept from electric carmaker Tesla and a diesel version of the Jeep Grand Cherokee. Young buyers can check out a small SUV concept from Honda. Big spenders â¿¿ and big dreamers â¿¿ can take a gander at the new Bentley convertible. But for all the gleaming metal, most models won't be new to fans. Corvette lovers have been salivating over drawings posted on the Web. Spy cameras snapped an Acura MDX last fall, months before its official debut in Detroit. Mercedes has already released photos of its E-Class coupe and convertible. But even with all those spoilers, visitors keep flocking to Detroit and other auto shows. They want to touch the cars, check out the trunk space or just hop in. "You can't do enough on a screen. You can't crawl inside and get a feel for it," says Rod Alberts, a 23-year veteran of the Detroit show who is now its executive director. Detroit is one of 65 shows that will be held in the U.S. this year, from a tiny one in Toledo to New York and Chicago gatherings that attract more than 1 million visitors each year. Detroit has been holding an auto show almost continuously since the early 1900s, when local dealers lined up a handful of cars alongside fishing and hunting gear.