yes, i was going to write something about that. as briefly as i can write, the supernormal phenomena i deem isn't intended to be as evident as our normal physical world, its laws, its workings, etc., and that could be the precise reason why it isn't so 'obvious', say like an object freely falling down to the ground due to gravity. we are perhaps meant to lead our lives with our tasks, our responsibilities, and fulfill our purposes, whatever they be, without interference from the 'not so obvious' to distract us from our journeys. but anyhow, the dimensions do intersect frequently, for good or bad, for reasons that may be not so easily known. i hope i have been able to explain somewhat.
plus, coming to ghosts and such, this is an insanely wide topic to discuss online or in writing alone. for one, most of the people are not sensitive to directly witness anything. at the most, their bodies would alarm them when seemingly no threat is present in an area (hairs on the neck standing on end, a gut-feeling telling you to just run the hell out of a place). this alarm could also get activated in a situation where a physical danger is present, but your eyes yet can't see its presence. ghosts, in particular, aren't scare-entities with the sole purpose of roaming around scaring anyone, as the movies would like us to believe. some are residual hauntings, others are spirits who aren't still aware that they have left their physical bodies, others are reluctant to move on due to strong attachments with things/people, a symptom more of our modern era i could say, while others are utterly confused on what to do, where to go. they are people too, have the impressions of their lives lead in physical form strongly imprinted on their sub-conscious, albeit now, these are people without flesh and blood, and many are miserable because they desperately want to cross-over and find some peace after leading the turbulent lives that an earthly existence guarantees, and hence, many of them are plain miserable. yes, its said that spirits are not evil, but miserable, and some times, malevolent (expecting the hung spirit of a brutal psychopath to be all goodie-goodie in spirit-form would be expecting too much; impressions do get carried over). since you've a good experience (second-hand, as in, witnessing others' experiences), you might also know that in some seances, only one of the subjects is communicated with by the entity, citing a previous relation/connection with the subject. many-a-times, the intelligent spirits (not the residual hauntings) establish a communication with them those who are receptive (either in belief, which is an almost-magical thing in itself, or in sensitivity, ie, can sense their presence). i think you may be a little more resilient in that regard. even i've rarely had any experience with ghosts and such, but spiritual experiences (ie, the non-spooky types), umpteen. but i know of a lot of experiences of others, like many of us here must be knowing. there are some who keep experiencing such things moderately all their life, taking it in their stride somehow, not revealing much about it to others; there are a few others who are extremely sensitive to these phenomenon, and find their calling in being psychics later on, and then there are others like you and me, who are very thick in sensing some of these things.
also, added to this is the fact that these are rare incidents to happen to any urban-folk (i write urban because, we city-dwelling citizens have lost a lot in sharp senses), plus, it doesn't happen that we plan to spend a night in a supposedly haunted house and the phenomenon just has to register with us. some people spend multiple days/nights to have an experience; perhaps that helps in 'acclimatising' their senses, i dont know. that is why mainstream science is so unrelenting in its approach towards the supernormal, as it wants to test something that is empirical & demonstrable, whereas these deliberately hidden workings of our world/universe reveal themselves in an entirely different way. as for us, may be, you and i have to wait for JUST the right time and moment, and 'it' would happen when we are least expecting it.
since you seem to be well-travelled, if you happen to be in UK for sometime, you may visit the village of Scole near Norfolk. this village was the location of an exhaustive study of seances by the famed SPR (Society for Psychical Research) over a period of some 5-6 years or more. the whole affair/study was utmost intriguing, to put it mildly. the study and its findings could (immensely) help understand/appreciate some of the 'whys' and 'hows' about this subject to a thinking person.
for back home, though i have read and heard of a lot of places (not the ones which feature on news channels at prime-time), writing about them here would be a dreary task. if you happen to be in Mumbai/Delhi, you could contact GRIP. they have local-units too in some smaller cities, and have led many expeditions with some very interesting results, esp. in their beginning years. now i find that they have become quite commercial, may be am wrong, but atleast you could get to know about many places that they've visited, their findings, etc. one cautionary note though - please don't try to venture out alone. plan and prepare, and take some friends along, or better, a person who is experienced in this. moreover, the danger from nightstalkers & criminals is far more, so, much better & safer to be prepared & act and remain alert.
as for the perils of such a hunt, some months back, i was at the village of a coursemate of mine, and was enquiring about any supernormal phenomena in his village (which i habitually do whenever i go to a place and am at leisure), and he specifically warned me not to try to be adventurous in this regard, for one could never know what things beyond our physical senses could do to our constitution, be it unintentional, or otherwise. and i could understand and appreciate his concern, though many individuals do go out to investigate such phenomenon on their own, all alone.
anyway, let's keep our discussion aside, and maintaining the decorum of this thread, by focusing more on relating our experiences than trying to explain/dissect them at length.
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this could be interesting to you too.
sometime back, two friends of mine reported having unusual experiences at the same location, on different days, but at the similar time (very early in the morning). both the friends don't know each other. the location is somewhere at Versova/Juhu. there's some graveyard nearby. both of them were out on their morning walk/jog.
one friend told this to us reluctantly, that he saw some person (man or woman, couldn't identify), not exactly from the corner of his eye, but yes, at a casual glance, turned his head away, and when again looked at that spot, there was no one there. time-gap between his looking, then turning his head, then looking again was just a couple of seconds. barely any other person around, and no traffic. this was during the winter last year. till now, he was insisting that he must've hallucinated, until i told him what another friend of mine reported. moreover, the first friend is a little more sensitive than us fellows (has had a couple of experiences earlier). the second friend, what he reported was that he was jogging around the same area, noticed a woman in a burqa, saw that she was just seeing straight ahead, without any head or neck or eye-movement, and seemed to be sort of gliding/floating, than walking. he didn't think much of this, and jogged a couple of feet ahead, and stopped to turn around, and there was absolutely no one there on the street nor in the vicinity. again, it wasn't like he went far away behind her and took a look after many minutes. understandably, this left him baffled. not suggesting that something supernormal took place, but yes, seems to be a bit out of the normal.