The humble gate, by itself, has Christian funerary typology. Douglas Keister, in his book Stories in Stone: A Field Guide to Cemetery Symbolism and Iconography, writes:
…gates represent the passage from one realm to the next. In scenes of the Last Judgement, gates are always central in the picture. Often Christ is seen breaking through these dividing barriers between the damned and the righteous.
![John Firth [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/e/eb/St_Michael%27s_Manafon_lych_gate.jpg "John Firth [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons")
A "true" lichgate (example pictured at right) is defined as "a roofed gateway to a churchyard, formerly used during burials for sheltering a coffin until the clergyman's arrival." It also covered pall-bearers waiting on the bier. A bier being "a movable frame on which a coffin or a corpse is placed before burial or cremation or on which it is carried to the grave." Dating back to the Middle Ages, when individuals were buried in little more than shrouds, the lichgate could also provide shelter over the bier itself before it was ready to be carried along the lych way (the path used to carry a corpse to burial).
According to Wikipedia, most lichgates were built from the 15th century forward, though some do date earlier. The lichgate of St. George's churchyard in Beckenham, London is said to be the oldest in England, dating back to the 13th century.
Though I don't think these structures are all that common today in their "traditional" form, especially in the southern United States, marked entryways into cemeteries do still exist. From the seemingly simple to a bit more elaborate. Here are a few that are fairly local to me.
Now here is a Georgia lichgate that could possibly pass as being patterned in the old style. Whether that was the intention or not, I don't know.
The dedication / memorial plaque near the structure calls the pathway through the gate a "prayer path." I say these could easily pass for a lichgate and lych way.
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