A back route suggestion might be
to take 108 South from Columbia
(clarksville Pike)
just after Ashton GA turn L on 182 S
to 97 S in Glenmont and then take a R on
Randolph Rd.
Take Randolph Rd. to 355 S (rockville Pike)
to Bethesda
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alternatively you could take
108 S
L turn on 650 S at ashton VA (New Hampshire AVe)
take 650 - New Hampshire AVe. to Randolph Rd
turn R on Randolph Rd.
take Randolph Rd. through Glenmont VA
and turn L onto 355 S which you can take into Bethesda
follow along with
Google Maps