FROM ORLY WEST:
Take the Orly-VAL shuttle towards ANTONY. At the ANTONY station take the RER B towards Paris and get off at Chatelet-Les-Halles station. Take the main Rue Pierre Lescot exit (estimated time: about 45 minutes).
FROM ROISSY CHARLES DE GAULLE :
Take the RER B to CHARLES DE GAULLE 2 TGV towards Paris, then get off at Chatelet-Les-Halles station. Take the main Rue Pierre Lescot exit (estimated time: about 45 minutes).
FROM BAUVAIS AIRPORT:
Take the bus from Beauvais Airport headed for Paris Porte Maillot; at Porte Maillot take Metro Line 1 towards Château de Vincennes and get off at Chatelet station.