Hear that sizzle? That's the sweet sound of grills firing up around the world to pay tribute to the beloved hot dog. A long-time symbol of American food culture, the hot dog is actually thought to have first appeared in Germany ("Frankfurt-er," anyone?). But now, deep fried or butterflied, this glorious piece of meat has taken on many-a-topping and found its way on to menus around the world. Here are Cheapflights.com's top 10 hot dog hot spots.