We've found 2 phrases for unsafe (0.147 seconds):

asphalt jungle »    A city or urban area, where the landscape is covered by pavement and the environment is alienating and unsafe.

concrete jungle »    An urban or other populated area containing a high density of buildings constructed of concrete or similar materials, especially one which lacks greenery and which seems unattractive, harsh, or unsafe.

New:  We also know Zip Codes FYI!