Faerie doors are turning up everywhere. Here’s a wonderful video about a town that has many of them.
(You can also see still photos at this article: If you walk around this town, you’ll see these tiny “fairy doors…”)
Here’s a safety tip: If you decide to make (or buy) one, be careful where you place it. If you put it against a basement wall — beneath ground level — you might attract dark and mischievous faeries. Some of them can be unpleasant.