Massachusetts

It's the "Landesgartenschau", roughly translated to "national garden exhibition".

A piece of wilderness or an existing park is uprooted and replaced with an artistic arrangement of flowers and trees and whatnot. In fact so artistic, that it's sometimes unsuitable for recreation. Just an example: Please imagine an artificial lake. In the middle of the lake there is a lawn, originally pitched at project-meetings as a playground for kids. Except that every ball and frisbee and toy-plane that goes beyond the lawn drops in the lake and is gone. What a fantastic playground!

And of course, the local community is left with the costs of taking care for this nice-to-look-at-but-wholly-impractical arrangement. While some communities long for the additional influx of tourists, many others outright refuse to host this exhibition because of the costs and the damage to existing flora.