Imagine living under the sea ... or in a giant rain forest ... or even in a tiny, claustrophobic capsule looking remarkably like a tomb. You can do all of this and more in the world's weirdest hotels!

From the Poseidon Undersea resort, with stunning rooms under the water (see picture) to Japanese capsule hotels, just large enough for a small bed, there's a lot of weirdness in this one.

I really loved the Poseidon, which really needs to be seen to be believed. The suspicious among us, however, might note that the picture looks a bit like a 3D rendering. The hotel appears to be under construction at this time.

Most of the other hotels that made the list are spectacular natural environments and are meant for eco-tourism. So if you have even a slight interest in that, the link's well worth a click.

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