Several centuries ago the Dutch bankrupted their country over tulips, now it is a mountain. The Netherlands is a notoriously flat, partially underwater country mostly known for windmills, dikes, and a kid with a thumb. But the Dutch always wanted to be Switzerland so they have decided to build a mile-high artificial mountain.
the highest spot is a hill at the tripoint of Belgium, Germany, and the Netherlands. But the Dutch have always wanted a real mountain that the can climb up, ski down, and jump off of. When a journalist wrote a joke about building a Dutch mountain complete with alpine villages the people decided it was a nifty idea.
The cost is no obstacle. The estimate is $300 billion or about half of the Netherlands GDP.