Sentence:  Just before coming to the mosque entrance I crossed the street , entered the Hippodrome , and <WSD>walked</WSD> ahead to the Obelisk of Theodosius , originally erected in Heliopolis in Egypt about 1600 B. C. by Thutmose , who also built those now in New York , London and Rome at the Lateran . 
Meaning of the word marked with <WSD> tags:  use one's feet to advance; advance by steps