If you’re planning a trip to Boston,...

If you’re planning a trip to Boston, look into buying the new Boston Passport. Offered for the first time this summer, the pass allows unlimited travel on the Massachusetts Bay Transportation Authority system.

It can be bought for either three or seven days. The three-day pass costs $8 and the seven-day version is $16. Passes for children 5 to 11 years are half price. Children under 5 can travel free.

The MBTA encompasses subway lines, trolley cars, bus routes and some commuter rail stops. The system operates seven days a week from about 5 to 12:30 a.m.

The pass also offers discounts to museums and sightseeing attractions, with many places of interest just a short walk from a subway station or bus line.

Discount Attractions

Among the discounted attractions are the New England Aquarium, Children’s Museum, Hancock Tower Observatory, Boston Tea Party Ship & Museum, Old State House, Computer Museum, Institute of Contemporary Art, Museum of Transportation, Skywalk Observation Deck, Museum of Science and the Museum of Afro-American History/African Meeting House.

Discounts off other transportation/sightseeing excursions include Boston Harbor Cruises, A.C. Cruise Lines (which offers Gloucester and whale watching cruises) and Boston Helicopter Tours.

Theater Costs Less

As for entertainment, the pass provides $5 off for all performances at the Huntington Theater Company, and half-off admissions to the Comedy Connection from Sunday through Thursday.

The Boston Passport can be bought at 25 locations around the city, including train stations and Greater Boston Convention and Visitor’s Bureau outlets. The pass is also available at Logan Airport and some major hotels.

For more information, write to Massachusetts Bay Transportation Authority, 120 Boylston St., Boston, Mass. 02116, or call MBTA Customer Service at (617) 722-3200.