Due to the Dead is an old trope. Very old. Based on archeological evidence, we have reason to believe that some form of it occurred as long as 300,000 years ago, as a practice among the Neanderthals. note Proper funerary rites are often deemed necessary to prevent the deceased from being Barred from the Afterlife and other evils, but what qualifies as proper varies widely. Cremation and burial are the most common, but such practices as exposing to the dead to vultures and other unusual methods are not unknown. Even slicing up the body has been done — as a means to free the soul from the body. This is often a time of danger, with the body being regarded as polluting. Some traits are widely spread, though not universal.
NorseAlthough the stereotypical Viking funeral is pushing a burning boat out to sea with the dead man, plenty of archeological evidence points to burial. Large mounds were built to hold the dead man and his grave goods, which could include slaves, and a ship. These, however, were often burned on a pyre before burial.
Eurasian SteppeAncient peoples of the steppes — the Scythians and their relatives, Sarmatians and Sakas — used to bury their lords in earthen mounds. From Black Sea's western shores to central Siberia, they often contained an abundance of artifacts, giving us immeasurable knowledge about the material culture of these peoples (and, in case of so-called Pazyryk burials, even of tattoos they wore). As befitting horse nomads, quite a number of mounds contain a skeleton of a horse alongside the primary occupant. Sacrificial slaves and retainers have also been seen.
ChristianityChristian practice is generally burial, normally facing east, because of belief in the resurrection of the body. Because cremation has been used historically to express disbelief in resurrection, it has been discouraged and even banned; nowadays most sects do not ban it because the use is not generally to express the disbelief. Grave goods are also not used. This is so prevalent that archeologists use burial ad orientum and lack of grave goods to determine whether a grave is Christian or pagan in times where either was possible (and observe that their findings grow much sparser as regions are Christianized and no grave goods are found). Family graves (graves containing the remnants of the same family in many generations) are commonplace in many denominations. As the old, large cities in Europe are running out of cemetary land, cremation and burial of the ashes in an urn are today the norm in many countries. The old family family graves can contain dozens of urns of the family members. "Burying the dead" is the seventh corporeal work of mercy, and there are, and have been, Christian charities for the purpose of providing such burials. Suicides are a special case. While frequently a person who had lived an openly and notoriously sinful life could be denied a funeral and burial in Christian ground unless repentant before death, a suicide has not only committed a sin but, for obvious reasons, could not repent before death. It was, indeed, common practice to bury a suicide at night, at a crossroads, and put a stake through the corpse's heart to keep it from rising from the grave as an undead figure.
ChineseThe body, in its coffin, is kept in the home, assuming the deceased is old enough for there to be junior people to pay respects to it. (Parents, for instance, cannot pay respects to an unmarried son, and he has neither wife nor children to do it, so his corpse must be kept in a funeral home.) Their descendents and daughters-in-law should wail and cry aloud. Offerings of incense and paper money are made. Once the wake is completed, the coffin is buried in the cemetary. At one time, rich grave goods, sometimes including human sacrifice, were included. This was transformed into the offering of paper money and other such substitutes which could be magically activated for the dead to enjoy in the afterlife. Indeed, during the time of transition, writings urged the magical substitutes on the grounds that graverobbers could not steal the goods this way. For more detail on the modern practices, see Chinese Funerary Customs
JapaneseIn Shinto, an oracle decreed that the appropriate funeral rites are performed by a Buddhist priest, which is normal nowadays. Cremation and the burial of the ashes in a family plot are the common form, though some people will choose to have their ashes scattered in one place and their family grave in another. Grave goods are generally flowers, pinwheels, or items that the deceased enjoyed in life left as offering and decoration at the grave both - alcohol and tobacco are common for this reason, and occasionally food items such as candy as well. (Stealing these from a grave or defacing a grave is generally considered a very taboo act and can result in everyone being barred from visiting the grave, or in criminal penalties as any other kind of theft/vandalism.) In the Japanese Visual Kei and Heavy Metal subcultures, those who attend wakes and burials of other artists are expected to tone down their appearance and dress as formally as possible (even if said appearance is a lifestyle appearance - someone who always has blonde or red or white or blue hair even offstage is expected to cut it as conservatively as possible and dye it black, or if this isn't possible due to upcoming work or events, to at least dye it a darker color or cover it). Anyone who knew the artist even as an acquaintance (and if the artist was famous enough, this includes fans as well) is usually expected to attend if at all possible, and if attendance is not possible, to send flowers and a card in their absence. Overly dramatic emotional displays are neither frowned upon nor demanded - it is very much "express how you truly feel" as a contrast to mainstream culture. Within those subcultures there are also occasionally annual or occasional memorial events or shows (usually on an artist's birthdate or death date, sometimes both - for example, hide's are on his death date and birthdate both, while Munetaka Higuchi 's are usually on or around his death date). These are less formalized and other artists, whether performing or not, are generally encouraged to appear in their style rather than toned down as they would be for a funeral, and a more celebratory atmosphere of the artist's life and work exists. These are, obviously, public events and open to all where a wake or funeral might be more restricted for a less famous artist.
IndiaThe normal Hindu practice is cremation, ashes scattered in the Ganges River.
IslamIslam mandates burial underground with the head pointing toward the Qibla, i.e. the direction of the Kaaba in Mecca from wherever you're standing. Much as burial pointing to the east is indicative of Christian burial, burial in the direction of the Qibla is indicative of a Muslim graveyard—if anything, more indicative, since the Qibla is so precisely defined and rarely a cardinal direction. It also mandates that the body be washed and wrapped in a plain white shroud as soon as possible—immediately after death is best—with the actual placement in a coffin (if any) and burial to take place no more than a few days after—preferably the same day, although this isn't always possible. Prior to burial, the body is taken to the mosque for noon or afternoon prayers, where a short (2-3 minutes) additional prayer called Salat al-Janazah ("Funeral Prayer") is added to the usual prayer for that time. This prayer is a collective obligation for the community; as long as a few people perform it, the obligation is relieved. Typically the imam/sheikh/whatever gives a short speech—no more than five minutes—just before the body is buried; there is a cultural custom that the deceased's close relatives take at least a symbolic part in the burial. Placement of grave goods is generally understood to be discouraged for being too similar to sacrifice and thus ancestor worship (you only sacrifice to God). Some ulema (Islamic scholars) say that Islam requires that graves be completely unmarked. Other ulema say that those ulema are full of shit, and that a small indication of who is buried may be necessary to facilitate the commendable custom of visiting the graves of relatives and ancestors. All agree, however, that markers must be small and unobtrusive—no tombs, mausoleums, columns, or what have you—or, for that matter, headstones as understood in the West. A low, flat bit of stone—that is all. Most ulema agree that although the community is collectively obliged to give condolences to the bereaved, it is forbidden from gathering to do so—so no memorial services, wakes, or other such events. Thus the families have a quasi-open house for a few days—generally the three-day period of mourning—with a few people at a time trickling in and out to pay their respects. The bereaved are forbidden to prepare food for those coming to give condolences; the community is expected to bring food to them. Finally, wailing, shrieking, breaking things, and other violent displays of grief are also strictly forbidden; Islamic grieving is supposed to be quiet, reflective, and dignified.
ZoroastrianismIn Zoroastrianism, the dead body is unclean and polluting. It can not therefore be either burned or buried, because that would sacrilegiously taint fire or earth. The body is therefore exposed on a Tower of Silence, so that vultures may eat it.
Tibetan Sky BurialIn Tibet, it is believed that one's body upon death is merely trapping the soul on Earth. So the body is taken to a mountain and cut into pieces for vultures to eat, who in turn carry the soul to the afterlife.
CommunistIn Soviet Russia and certain other countries of the Soviet bloc, special burial rites were created to replace those of the displaced religions. The most common was cremation; the Communists stimulated its use due to the fact that it's un-Christian, to express disbelief in the "priests' myths". An upgraded version of cremation was burying the urn in some special place of honor, like the Kremlin Wall Necropolis in the USSR. It was reserved for important dignitaries. Finally, the most glorious leaders were interred in mausoleums, after undergoing a special mummification process that preserved their life-like appearance.