  The classical No-Three-In-Line problem seeks the maximum number of points
that may be selected from an $n\times n$ grid while avoiding a collinear
triple. The maximum is well known to be linear in $n$. Following a question of
Erde, we seek to select sets of large density from the infinite grid $Z^{2}$
while avoiding a collinear triple. We show the existence of such a set which
contains $\Theta(n/\log^{1+\varepsilon}n)$ points in $[1,n]^{2}$ for all $n$,
where $\varepsilon>0$ is an arbitrarily small real number. We also give
computational evidence suggesting that a set of lattice points may exist that
has at least $n/2$ points on every large enough $n\times n$ grid.
