I dream of a cycletrack across Rock Creek Park on Military Road NW
North of Michigan Avenue there isn't really a good east-west road crossing the entire northern part of the city, other than the combination of Riggs Road-Missouri Avenue-Military Road.
Left: 1967 Shell Map of Washington DC. (It shows proposed routes for intra-city freeways too.)
Using Military Road is the the only way to get from my part of the city to Friendship Heights or Chevy Chase, but it's a terrible place to cycle because the road is narrow and/or the cars drive really really fast.
While it would be expensive to create, there is space on the park sides of the street to incorporate a cycletrack.
Meanwhile, those cyclists brave enough to ride here do so like this.
It might look pretty but it's neither comfortable nor safe.
(Speaking of being the "odd man out," when people tell me how great it is to bike in DC because we have more than 50 miles of bike lanes and cycletracks, I counter with the point that we have close to 2,000 miles of traditional roads.)