Calgary’s +15 network is one of the world’s largest elevated walkway systems: 16 km of weather protected bridges linking 100+ downtown buildings. Designed for brutal winters, it keeps people moving without stepping outside. The city is upgrading it for accessibility, and it boosts retail, food courts, and cultural spots year round. More than infrastructure, the +15 has shaped Calgary’s identity, economy, and even art,

A defining feature of life downtown.

Wiki : https://en.wikipedia.org/wiki/Plus_15