Which place is it?
It is a train station.
    src        edge_attr  dst
0     0   to the left of   18
1     0   to the left of   10
2     0   to the left of   13
3     2  to the right of    6
4     2   to the left of   12
..  ...              ...  ...
62   19   to the left of    9
63   20  to the right of    6
64   20  to the right of   10
65   20  to the right of   19
66   20  to the right of   18

[67 rows x 3 columns]