When you find lodging the Airbnb way, you'll not only get a unique place to stay for the night, but you might even make some new friends along the way. Airbnb is the company that helps homeowners make their casa your casa. Here's how it works: You go on the site and peruse the available listings for a place to stay in the city or town you're planning to visit. Airbnb acts as the middle guy between you -- the guest -- and the person renting lodgings -- the host. But that tidbit of knowledge really doesn't speak to what an adventure Airbnb provides for you as the traveler. The company opens the door for you to stay overnight (or longer) in castles in France, on houseboats in Amsterdam, in sleek, modern apartments in Bulgaria, or even in a mud hut in Portland. Naturally, you could just book a hotel for a more normal place to stay, but why would you want to do that, when your Airbnb castle and new friends await you?