What's the longest distance between two points I can walk indoors?

Question

not including subway train lines, sewers and particle accelerators.

I mean maximum distance between your start and end points. And I want to know where in the world this walk could take place. It's VERY important!!!

No no no. Not in my house (you should get out more). The boeing answer is more on the right track. Imagine the great wall of china had an underground level (maybe it does). That would be a great answer. Try harder.

Answer 1

The largest covered commercial building in the world is the Aalsmeer Flower Market in the Netherlands.

It has a floor area of 99 hectares (just under 1 million sq. meters). The only reference I've been able to find about dimensions places its length at 2.5 km. This easily beats Tempelhof airport and it would be in a straight line.

Here's another thought, the longest passenger train created was 1733 meters long. Amazingly, this was in the Netherlands again. See the link. I guess you could walk between cars quite easily, thus staying indoors.

Although it no longer exists, there was once a covered bridge that spanned the Susquehanna River in Pennsylvania. It was 1817 meters long. It's on Wiki.

Answer 2

The Boeing HQ in Washington state does still stand as the building with the world's largest useable space. However, that is measured in volume and, unless you plan to walk the ceiling and walls, is not very meaningful for you.

You should choose a building based on its total floor area and most people seem to put the Pentagon (with nearly 7 million sq ft) at the top of the list. It's closely followed by the Palace of the Parliament in Bucharest, the pride and joy of Nicolae Ceauşescu!

Answer 3

Montreal's Underground City keeps growing; I'm not sure how big it is these days. It started out as a linking of Metro stops, train stations, colleges, government buildings and malls, and keeps seeninb new parts added.

According to Wikipedia, it includes "32 km of tunnels spread over an area of twelve square kilometres, the 60 residential and commercial complexes comprise 3.6 square kilometres of floor space," but I believe this includes all segments, including some not yet hooked into the main passages. Most passages are hooked into a large "U" shape.

Answer 4

In your house? Mmmm!
Stand at your front door. That's your starting point. Move forward keeping to the right side wall. Whenever you come to a door, or gap, keep to that right side wall, including going into cupboards, closets stairwells, garages, basements, whatever. Keep to the right hand wall. Eventually, you'll find yourself heading back to your starting point. JUST before you reach it. Stop. That's the finishing point.
That's the longest distance between two points you can walk indoors. (unless you backtrack leaving a slight gap between you and the LEFT had wall.......... Think about it, you could go for MILES!)

Answer 5

London underground, there are literally hundreds of miles of tracks. They employ teams of bods to walk different lengths each night once the tubes stop running, to inspect and clear litter etc. You could spend weeks down there without any route repitition.
Supposedly, there are wild ponies living down there. When the lines were first constructed they used ponies to drag the carts of rubble etc. Some escaped and supposedly bred and live down there, blind as bats but with other crazy magnified senses. I'm a bit sceptical myself though...

Answer 6

The 1200 meter long Tempelhof International Airport building in Berlin.

Answer 7

Well the Nottingham City Hospital has a corridor that's about 3/4 of a mile long, Lord knows I've walked it often enough!

Answer 8

No, you need to try harder to define your question. You still haven't said that the walk must be in a straight line, or that you cannot walk over the same area multiple times, or that you cannot cross your path. Is that your intent?

Otherwise, the "circle" answers are valid.

Answer 9

I think the biggest indoor space in the world is acually at Boeing Aircraft in Washington. Their hangars are massive at an impressive 100,000 square feet.

Answer 10

Calgary in Canada has a kind of elevated enclosed walkways that allow you to walk around the downtown area without going outside - so that would be one possibility.

Danny