No one has mentioned Calgary's inter-office skyway: https://en.wikipedia.org/wiki/Plus_15

10 miles/16 km.

I've actually never been, but saw it featured in a CanCon movie, waydowntown, where a group of office workers wage a month's salary as to who can stay inside the longest: https://en.wikipedia.org/wiki/Waydowntown

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bluefirebrand a day ago | parent [-]

It's very cool. I live in Calgary and you can go pretty far in the +15 network

Called the +15 because it's 15 feet above ground

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giarc a day ago | parent [-]

Fellow Calgarian here. I like how the term "plus 15" refers to any elevated path in Calgary. For example, the link between the new cancer centre and Foothills Hospital is often referred to as the Plus 15.

	▲	papandada 20 hours ago \| parent [-]
		Of course other than the double-decker at Bow Valley College, referred to as plus-30. (edit to add: and plus 45 in Bankers Hall)