Washington Dulles International Airport (IAD) anchors Sterling's location — the main international gateway for the DC metro, about 5 minutes south of both hotels via VA-28 and the Dulles Access Road. The Steven F. Udvar-Hazy Center (a Smithsonian air and space museum) sits next to Dulles and houses the space shuttle Discovery, the Concorde and hundreds of aircraft.
Great Falls Park on the Potomac (about 15 minutes north via VA-193) is a National Park Service unit with dramatic waterfall overlooks, the Patowmack Canal ruins, and hiking trails through the Potomac Gorge. Algonkian Regional Park and the seasonal Volcano Island Waterpark offer summer swimming on the Potomac.
Reston Town Center (about 15 minutes south) is walkable for Market Street shops, restaurants and the Silver Line Metro to DC, and One Loudoun in Ashburn (about 15 minutes west) is an outdoor lifestyle center with restaurants and boutique shopping. Loudoun County wine country to the west has over 40 wineries within a 30-minute drive, and Loudoun County Fair (August) and the Dulles Day Plane Pull (September, at IAD) round out the summer-fall calendar.
There is more within easy reach: Washington Dulles International Airport (IAD); Steven F. Udvar-Hazy Center (Smithsonian air and space); Great Falls Park on the Potomac (~15 min north); Reston Town Center (~15 min south); Loudoun County wine country (~30 min west). Seasonal highlights: spring Great Falls trails and Loudoun wine patios, summer Algonkian and airport travel, fall wine country color, winter off-season Dulles-corridor rates.