Which place is it?
It is a train station.
    src        edge_attr  dst
0     0  to the right of   20
1     0  to the right of   18
2     0  to the right of    4
3     1   to the left of    2
4     2   to the left of   17
..  ...              ...  ...
65   19   to the left of   14
66   19   to the left of   10
67   20   to the left of    0
68   20   to the left of   11
69   20   to the left of   15

[70 rows x 3 columns]