When designing a building, you have to account for things like terrain, materials, weather, handicapped accessibility and, of course, ghosts.
You can design a building more awesome than the Guggenheim and nobody will want to go in it if there's evil spirits just running through it willy-nilly. With that in mind, here's how people in different parts of the world build guaranteed demon-free housing.
6Chinese Curved Roofs
Quick, what do you think of when I say, "Chinese architecture"? The first thing you probably think of is that the doorways don't need to be as high, and then the second thing is probably those weird curvy roofs like you always see on pagodas.
Why do they build them that way? Because of ghosts. Did you know that spirits can only travel in straight lines? Well, according to Chinese tradition, anyway. Sure, they might be evil spirits, but they're Chinese evil spirits, dammit, and they are going to do things by the book. None of this individualistic zigzagging and newfangled "turning." No sirree, we're just going in traditional straight lines like we've been doing for thousands of years, thank you very much.
They're also afraid of fireworks. Goddamn, do we have the stupidest evil spirits ever.
That's the explanation given for many curvy roads and paths in China, and the fact that it's easier to curve the roads to follow the contours of hilly terrain is probably just a coincidence.
This is an actual military road in China. I'm sure it's completely ghost free.
And that's why Chinese roofs are curved, supposedly. I'm not sure what happens when the straight-line spirits hit the curvy roof but I like to think they slide along the curve and fly right off the end, and also that they go, "Wheeeeeeeeeee!" while doing it.