Remember how small your first apartment was? Well, that cubicle-sized studio doesn't even compare to these tiny hotel rooms, most of which you won't even be able to stand in.

These rooms do have their perks. What you save in space you'll also save in your wallet - and some of these locations aren't to be missed.

By far, the center of this trend is capsule hotels in Japan (think sleeping in a tanning bed). Hotel guests can expect a whopping 18 square feet. Check your shoes and bag into a locker and climb into stacked square holes that tall guests would be lucky to sit up in. The space itself looks more like a morgue than a hotel. Most rooms include a television and Wi-Fi connection, but it's hard to imagine hanging out in a space consistent with a coffin.

These rooms can be an efficient and cheap alternative (usual between $25-55) in cities like Tokyo that are cramped for space. They also make for a great escape for businessmen who have had a few too many drinks, before returning home to their wives in the morning.

Not all of these tiny rooms were created like the cookie-cutter capsules. Eco-friendly and creative engineers are repurposing unusual items like concrete drain pipes, oil rig survival pods, and Boeing airplanes. At Das Parkhotel, with locations in Austria and Germany, sections of large drain pipes are turn into modern chic rooms - loft-style exposed concrete is in ... right?

The Netherlands is the original home of the Capsule Hotel, which turned orange rafts into quirky hotel rooms, although  they appear to look more like floating flying saucers used on the set of a low-budget sci-fi movie. Surprisingly, these rooms offer less luxury than the drain pipe, with a fisherman's net hammock bed covered in sheep-skin rug.

Press Start to view all of the teensy, tiny hotel rooms.