City Hall upgrade

PHILADELPHIA (WPVI) -- Philadelphia's city hall got an upgrade to its exterior Wednesday, but it has a story that dates back more than a century.

Large designer portal gates are going up around the entrances of city hall.

They will replace the chain linked fences.

The portal gates were first sketched in the late 1800's

Mayor Nutter says it's all part of preserving and improving city hall which is a national historic landmark.