These are more well known as the historic brick arches that date back to the mid 1800s. The city uses these for drainage that goes back out into the harbor, but before they were for sewage management.

A keystone is the wedge at the top of an arch upon which all the other components lean. Keystones are usually masonry in either cut stone, cast stone or brick. The key design feature is the last ...

‘Each brick was hand cut and finished and bonded to a steel frame to form each stepped layer of the arch over curved glazing, to create an illusion of floating heaviness,’ say the architects. ‘These ...