By Brandon Charles Leaves are on trees, which means it’s time to leave the city. Washington, D.C. is conveniently located near beautiful national parks, frolicking horses, stunning vistas and drive-in movie theaters. “Near” is the key word in that sentence. If you truly want to get away from the city, you’re going to need to get in a car, but our six picks are all under a four-hour-or-so drive from D.C. (depending on traffic, of course). They’re also all more than two hours away from the district. Prices range from $10 to $439 a night, so whatever your budget, we’ve got you covered. Whether yo…