Going back as far as the Roman times, in ancient Rome Man has started using stone to protect drain covers.

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Going back as far as the Roman times, in ancient Rome Man has started using stone to protect drain covers.
The layman term for drain cover ( Jonite drainage covers ) is manhole cover. Say "manhole cover" and pictures of spies/heros making use of the underground sewage system popping out of Jonite trench grates in Hollywood films appear.
Historically since that time Man invented the sewage system since the Roman Times to drain water and urban waste away for sanitation purposes, manhole covers (drain covers or grates as we would like to call them) have already been invented out from the necessity in order to avoid people from falling into underground sewage as well as to prevent large objects from entering the drains which cause choking which eventually may lead to flooding.
Fast forward to the present day, Jonite drainage covers is still being used under all cities all over the world. Instead of the crude stone manhole covers the Romans use in the ancient days, now we have special steel reinforced stone gratings that serve the thousand year old function of covering the inlets of our sewage system.
A lot more than a cover, check out Jonite's range of drain covers (drain gratings) here: http://www.jonite.us/products/creative-grates

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