Every bed and breakfast has a special charm, something that sets it apart from all other B&Bs (for better or, occasionally, worse). But from time to time, you run across an inn that is so unique, unusual or just plain strange that it demands to be included in a class of its own. Here are some of the most unique bed and breakfasts anywhere in the world. You can sleep in a cave, on a private island, or in a castle.

More Unique B&Bs:

• Lighthouse Bed and Breakfasts
• Cedar House Inn & Yurts
• Former Slave Quarters