Is there an obvious/natural/simple CW complex structure for punctured Euclidean space, $\mathbb{R}^n \setminus \{0\}$?
EDIT: Here's what I've thought of. I can build $\mathbb{R}^n$ out of countably many cubes $e^n = [0,1]^n$ and attaching them along faces. Maybe I can build the interval $(0,1]$ as a CW complex by attaching infinitely many 1-cells $\{[1/(k+1),1/k]\}$ for $k \in \mathbb{N} \cup \{0\}$? I'm not sure if this is a CW complex. If it is, perhaps it can be generalized to higher dimensions.