Two hundred years ago, lighthouses to guide ships away from dangerous coastlines were a common sight. While lighthouses are rarely used for their original purpose today, many of the structures are still standing. If you're looking for an unusual way to celebrate National Lighthouse Day—today, August 6—consider booking a night in one of the dozens of decommissioned lighthouses across the globe that are now used for lodging.

BookaLighthouse.com is like Airbnb for lighthouses. To plan your seaside vacation, first choose the location you'd like to visit: the website's database features lighthouses on four continents including North America.

Once you've decided where you'd like to stay, Book a Lighthouse brings up all the available lighthouse options in the area. In Michigan, you and up to 13 guests can stay at a lighthouse-turned-bed-and-breakfast on the shore of Lake Superior. On the other side of the Atlantic, you'll find a lighthouse on its own island 15 minutes off the Swedish mainland. Rates range from as low as $38 to around $450 per night, and amenities like breakfast, sheets, and towels are often included.

The website is a great resource if you have your heart set on a nautical getaway, but it's not the only service that features lighthouse vacation homes. A quick search for "lighthouse" on Airbnb brings up listings around the world. And if you're looking for a more permanent situation, the U.S. government regularly sells old lighthouses to private citizens for low prices.