The historical city of Bruges now has an underground (or tube) - only, through don't go trains but BEER.
Brewery De Halve Maan (Half Moon) which produces the regional beers Brugse Zot and Straffe Hendrik has the crazy (?) idea of changing the way the beer was transported from the brewery right in the middle of the town center to the bottling plant further away. Up to now at least 12 vans a day had to transport the kegs of beer to this bottlery.
The project of course, was not simple. The brewery could not immediately find a contractor who wanted to undertake the job - which included boring pipelines underneath the historical part of Bruges, deep enough not to disturb the other utilility lines. And it would cost a lot! Therefore they thought of crowdfunding.
You can imagine a lot of inhabitants of Bruges were glad enough to join in! For a share of 220 € you'd get a big bottle of Brugse Zot at your birthday, lifelong, and for an even bigger share of 7500 € you'd receive a beer every day of your life. This way, over 340,000 € was gathered from locals.
The undertaking was a success, and as of today, thousand liters of beer flow underneath the city. Less traffic is good for the city, and also tourism will take advantage of it. At the brewery, you have a glass platform from where you can see the beginning of the pipeline.