Offers full-service tours in the District, Virginia, Maryland and Pennsylvania. Includes historical information and a slide show.

Offers guided interactive bicycle tours, morning exercise rides and bike rentals. Includes online booking.

Potomac River cruises and charters.

A tour of Georgetown's homes and gardens held on a weekend at the end of April. Different houses shown on Saturday and Sunday. Ticket includes afternoon tea.

Membership organization of licensed professional tour guides and tour operators. Includes information about the guild and about being a tour guide.

Offers personalized tours, "meet and greet" services, and entertainment planning for meetings or conventions.

Operates Old Town Trolley city tours and amphibious DC Duck land and water tours. Tour descriptions and online ticketing.

Guided tours of Washington DC, Baltimore, Annapolis, and Historic Southern Maryland.

Washington, DC-based firm offers tours of Rajasthan, India. Includes tour descriptions and information on Rajasthan sights and lodgings.

Cruises and tours on the Potomac River featuring lunch and dinner, live entertainment, and sightseeing.

Narrated tours of the White House and DC monuments. Offers daytime, nighttime, and customized tour packages.

Operates daily narrated tours of major tourist sites. Information on tours offered, the stops along the way and buying tickets.

Specializes in multi-cultural historic touring. Includes programs.

Guided walking tours. Information on the itineraries, schedules, and rates.

Offers multilingual tours and transportation. Includes rates, online reservations and a newsletter.