In France, this fantastic 13th-century Castle-building (click here) project is still ongoing. I believe it's in it's 16th year of construction now. Basically, it's an amalgamation of building, science, tourism and "super cool idea". The builders use 13th-century building techniques, tools and methods. Tourists pay to watch the construction in action. Their money enables this project to continue. (Note to wife: I believe I can apply to get on the building crew. Just need to learn basic French. Not a problem!)