Martz Group-Gold Line Gray Line DCVisit WebsiteGet Directions Details Amenities Details Gray Line is Washington, D.C.'s premier sightseeing & charter coach company. We provide a wide array of specialized sightseeing tours. Hours See website for hours. Location5500 Tuxedo RdHyattsville, MD20781Get DirectionsContact Local Phone: 301-386-8300 US Toll Free: 240-426-5381EmailSocialFacebookTwitterMapCapital Region Amenities Group Tour Rates OfferedGuided Tours/Guide AvailableMember of American Bus AssociationNumber of Buses70Number of Motorcoaches70Receptive Tour ServicesStudent Group-FriendlyPlaces NearbyAccommodationsDays Inn by Wyndham-LanhamLearn MoreAccommodationsLa Quinta Inn & Suites by Wyndham DC Metro Capital BeltwayLearn MoreAccommodationsRed Roof Inn-LanhamLearn MoreAccommodationsWoodspring Suites-Hyattsville/Washington DC EastLearn MoreAccommodationsCountry Inn & Suites-Capitol HeightsLearn MoreSee More For Capital Region