A highlight of a visit to the Old Post Office Pavilion is always a 360-degree picturesque view of Washington. From the observation deck of the 315-foot granite Clock Tower, you can enjoy the city's second highest vantage point after the Washington Monument. The Clock Tower also houses the Congressional Bells, a bicentennial gift from Great Britain to the U.S. Congress. Modeled after the bells of Westminster Abbey, they were cast at the famed Whitechapel Bell Foundry in London. The Washington Ringing Society sounds them on special occasions as well as Thursday evenings. The National Park Service offers free daily tours of the Clock Tower. For more information, please call 202-606-8691. Also available is Washington's old-fashioned trolley tour of the city sights, departing with daily schedules from The Old Post Office Pavilion. For more information and schedules, call Old Town Trolley Tours at 202-832-9800 or visit www.trolleytours.com.