A manhole cover is generally deemed successful if its round shape keeps pedestrians from plummeting into the earth, and communicates the subterranean systems below through its design. New York City ...

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Manholes are an essential yet overlooked part of urban infrastructure. They provide access to the underground systems that are important for maintaining the flow of water, sewage, and electrical ...

They are heavy disks of cast iron that separate us from our subterranean sewage, but in Japan, they are also highly coveted works of art, symbols of regional pride, and now, sources of revenue. Local ...

The Napa Sanitation District wants at least some local manhole covers to have a bit of flair — and to clearly identify the agency. It wants to put its distinctive stamps on those round metal discs ...