I followed their trail, they came from...

Dol Guldur (28th street station; downtown 1 train)

Dol Guldur (Grand Army Plaza station; 2 & 3 trains)

Dol Guldur (Fulton street station; 2 & 3 trains.)

Dol Guldur (7th Ave station; downtown B, D & E trains)

Dol Guldur (Times Square/42st street station; downtown 1, 2 & 3 trains)

Dol Guldur (Lincoln Center/66th street station; uptown 1 train)

Dol Guldur (59th street station/Columbus Circle; downtown A, B, C & D trains)

(Times Square/42st street station; downtown 1, 2 & 3 trains)

Dol Guldur (Fulton street station; Church Ave bound G train)

Dol Guldur (28th street station; uptown 1 train)

Dol Guldur (2014)