Washington, DC is only 10 square miles, but it’s crisscrossed with 48 miles (and counting) of dedicated bike lanes. The city has a booming bike-share program, but the three-gear rides are more suitable for quick errands, not a day—or night—of two-wheeled sightseeing. Bike and Roll has legions of bikes, sized to each rider, with helmets, bike maps and accessories like child trailers and tandem cycles. There are three locations in the District: L’Enfant Plaza, MLK Library and Union Station, where would-be riders can arrange for guided tours of the monuments, distinctive neighborhoods, and only-in-DC routes like “Capital Sites at Night,” as well as seasonal tours like cherry blossom-centric rides in the spring. Some rides are as long as eight miles and last three hours. Bike and Roll welcomes young riders, unlike Capital Bikeshare, which requires rollers be 16 or older. 202-842-2453, bikethesites.com.