Hidden away in a rural corner of Japan, this 100-foot-tall "dragon" comes complete with a gaping, toothy maw. What looks like the remnant of some long-lost theme park is in fact a playground for very lucky kids. This play area is so over the top, it's the sort of thing that seems like it could only arise from the creative accounting department of a rural municipality department that just has to spend their budget by year end.

The views from the top of the dragon are very impressive, and you'll almost certainly be alone when you go, which adds to the excitement. You could combine a visit here with a stay at the tree-shaped houses nearby. There's also a refreshingly lax approach to health and safety, whereby you are completely free to look out of the jaws at the top, unhindered by such fripperies as netting or suchlike to stop you falling into the forest 100 feet below.