Location: Downtown Minneapolis, Minnesota
When to visit: Most skyway tunnels are open 6:30am-10pm Mon-Fri (shorter hours on weekends)
Time needed: 30-60 minutes
Just as Houston has an underground tunnel system to help residents avoid the heat, Minneapolis has an above-ground skyway system to help residents avoid the cold.
The skyway connects the Convention Center, Target Center, Wells Fargo Center, City Hall, University of St. Thomas, and dozens of other prominent buildings and institutions as it covers 11 miles
You can connect to stores, offices, residential buildings, and pretty much everything else imaginable. If you really wanted to, you could spend several years inside here without ever going outside. That kinda sounds like a fun experiment, actually – like my Mall of America experiment times 1000.
Oddly, it can be a little difficult to find the skyway entrances. A few are obviously marked, but many are not. Just look for the tunnels in the sky, enter that building and head up to the second floor.
Here’s a link to the official Minneapolis government map of the skyway (PDF.) Here’s a slightly better map that shows exactly which tunnels are connected to which buildings. With the skyway, you can’t let the weather be an excuse for not going out and exploring Minneapolis.