Californian city to get 'marijuana innovation zone'

City links: Growing the green stuff in Arcata, bike-friendly Jakarta and Auckland's ancient underground waterway feature in this week's best city stories

This week's best city stories from around the web talk about marijuana zones in California, a forgotten waterway under the streets of Auckland, a mushroom farm in Camden and mime-artist-assisted traffic control in Bogoti. We'd love to hear your responses to these stories, and any others you've read recently, both on Guardian Cities and elsewhere. Just share your thoughts in the comments below.