And as I've told the other poster if you can provide evidence (not opinion) that F:NV has considerably less exploration than FO3 I'll be happy to take back my comments
evidence, FO3 metro tunnels were huge and some of em complex, so there's like 100 times more tunnels right there alone, lets talk about the caves, in FO3 they were pretty big, new vegas they were all small, new vegas filled up the map with some one room shacks and tents. FO3 had radar stations, power stations, and plenty of cisterns scattered around, FO3 had tons of battlezones, i'll name a few, both sides of the capitol building, la enfant plaza, gnr plaza, falls church area, georgetown, seward square, takoma industrial and really the entire downtown area, new vegas doesn't have anything compared to that, the strip is boring as hell. :batman:
as far as large buildings, new vegas has both repconn facilities and helios one, and those are the biggest, and even they aren't that elaborate, FO3 has tons of large places with mutliple stories, basemants etc, let me name just some of em, national guard armory, lob enterprises, chryslus building, roosovelt academy, red racer factory, robco, the statesman hotel, the hospital and the hospital underground, the library, vault tech headquarters, alexandria arms, nuka cola plant, talon base, the capitol building, national archives building, dunwich building, anchorage memorial, there's more i left out but thats a lot bigger list than new vegas.