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Walk through Liberty Park towards the Church
Go down the stairs on the left side of the Church
Turn left at the base of the stairs and cross Liberty Street
Head North along Greenwich Street past the 1-Train entrance
Continue past the 9/11 Museum to Fulton Street
Cross Fulton Street and turn left. Continue on Fulton Street to West Street and head towards One WTC
Turn right to the entrance of One WTC that faces West Street and go towards the entrance
Enter through the doors. Buy tickets and/or take escalator down to the Observatory