Travel comes in all shapes and sizes. From dream vacation homes and cruises to scoring a deal on airline tickets, more and more customers are finding their travel needs online. In recent years, over 80% of travel has been booked via a website or mobile app. The upside of the online travel industry is that it allows for easy price comparison and trip personalization. The downside is that it requires a little more research and effort from the buyer than using a traditional travel agency. Check out the most popular travel sites of today for vacation inspiration.