The G2 Metrobus route should soon turn commuters into tourists in a self-guided tour down Washington's architectural past.

"Don't Tear It Down," a non-profit organization dedicated to the preservation of the city's landmarks, has found a way to give people a history lesson and a bus ride at the same time. Beginning on Monday, June 20, free map/leaflets will be available in the "take-one" racks in buses on the G2 route - between Georgetown, Dupont Circle, Logan Circle, LeDroit Park and Howard University. The maps note the numerous landmarks along the way, including buildings, churches, parks and homes, with information on the history and character of each one. A second map, covering 16th Street on the S2/S4 routes will be available soon.

Pictured above: Georgetown University, the country's oldest Catholic University, which dates from 1792. Healy Hall was built in 1879 by Smithmeyer and Pelz, designers of the Library of Congress. St. John's Church, consecrated in 1809, housed the second Episcopal parish in Washington. Dupont Circle, once the city's most fashionable address, where mansions were turned into boarding houses during wartime. White foutain by Daniel Chester French. Shiloh Baptist Church was founded in 1863 and moved to this location in 1926; it's famous for its stained-glass windows and Victorian charm. Howard University, founded in 1866, boasts several examples of Georgian Revival architecture as well as Gen. Howard's original house built in 1867. The Blaine Mansion was built in 1882 for presidential candidate James G. Blaine and was Dupont Circle's finest home. George Westinhouse, famous for his work in electric energy, also lived here. 1785 Massachusetts Ave., once a luxury apartment building, is the birthplace of the National Gallery of Art. Andrew Mellon lived here and started the famous art collection he gave to the country. Logan Circle, now recognized as a historic district, is the only circle in Washington to retain its original residential character. Ornate victorian structures that once housed diplomats and politicians are currently being restored. O Street Market, one of the three 19th-century markets in the city, is being restored to its original state and will function as the centerpiece for a surrounding commercial area now being planned.