At the left is the I-495 interchange with Route 123 and the elevated ramp access to the HOT lanes from Route 123 (Tysons Corner), in Fairfax County, Virginia.
SR 123 passes by the Marden House before entering the northwestern corner of Arlington County and meeting the northern end of SR 120 (Glebe Road).
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East of the center of McLean, SR 123 passes by the preserved Salona estate and close to Hickory Hill—a historic house on Chain Bridge Road that was home to Robert F. Kennedy—in Langley, where the state highway meets the eastern end of SR 193 (Old Georgetown Pike).
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SR 123 is a partial circumferential highway in Northern Virginia that connects Woodbridge in eastern Prince William County with the independent city of Fairfax and the Fairfax County communities of Vienna, Tysons Corner, and McLean, the last the home of the National Counterterrorism Center and the Central Intelligence Agency.
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