Hi folks. I just joined the list because I've long held a dream of building a specific site.
What I'm talking about is a geek/engineer tourism site. I'm one of those sad types who, when touring around Vietnam, stops and gawks at big (http://www.rumble.net/travel/photos/vietnam/nw/thumb/nwdamfish-9-0.html) and small (http://www.rumble.net/travel/photos/vietnam/nw/thumb/nwhydro3-9-0.html) engineering marvels.
So I'd like to have a site that collects information about this kind of thing. Power stations, significant dams, historic sewage system features, giant tunnels, spy stations, bomb shelters, architectural marvels and follies, engineering accidents, atomic bomb test sites etc etc. The site would include photos, historical information, transport information, opening hours and prices, details of preferred viewing sites and GPS coordinates.
So it occurred to me that Openguides has already achieved much of this in a suitably open and geek-ready format. However, it doesn't fit your ontology. Your site gives guides for a particular city or region, whereas this idea would work best as an integrated, global site. That way you could look at a meta-topic on an area of interest (say, atomic test sites).
I can see this cross-guide linking is probably a problem you've already encountered (compare the tube networks of London and New York) and discussed, so I'm curious to hear your thoughts.
So is this something Openguides would be interested in pursuing? Of course, I'm offering to maintain the content.