Well, not in 20 minutes, even 1 minute by car. It is only happening in Istanbul, Turkey through the bridges of Bosphorus and Fatih Sultan Mehmet, either one is fine. Let's take a look at one traveler's blog. He covered a nice array of idea about crossing from one continent to another. I came across to one more traveler's blog who shared this picture on the left. It is the Bosphorus Bridge.