DOWNTOWN. Considered one of architect Henry Hobson's greatest works, this magnificent Romanesque-style structure occupies two square city blocks. The Bridge of Sighs, where convicts traversed from court to prison, is just part of this National Historic Landmark's rich history. Group tours provided by the History and Landmark Foundation, and a self-guided tour (visitors follow a brochoure) is free.

OAKLAND. Located adjacent to Schenley Park. Founded in 1900 by Andrew Carnegie, today the institution is made up of 7 colleges. Tours of campus available during the summer months.

OAKLAND. The center of the University of Pittsburgh's campus is a 42-story Gothic-styled structure known as The Cathedral of Learning. The entrance to the educational facility is a three-story room with slate floors, columns, arches, and a massive fireplace. Wrought-iron gates separate the Commons Room from the banality of elevators whisking students to classes above. People in the Commons Room murmur in low tones as if they're in a library, making it a great spot to read, people-watch, and listen to tunes.

MILL RUN. Fallingwater is a Frank Lloyd Wright masterpiece, now maintained by the Western Pennsylvania Conservancy. The structure of stone, concrete and glass is a staggering multi-level home cantilevered over an actual waterfall. The regular tour lasts about 45 minutes, the in-depth tour about two hours. There is also a children's tour, and a three-hour combination tour of the home and surrounding landscape. Fallingwater is closed during Jan-Feb for maintenance. Advanced reservations are required ­ book regular tours at least 1 week in advance, in-depth weekday tours two weeks in advance, in-depth weekend tours 4-6 weeks in advance. Children must be 6 years old to accompany an adult on a regular tour, 9 for an in-depth tour. Younger children may stay at the supervised Child Care Center for $2/hour per child.

NORTH SIDE. These streets were named for battle sites of the Mexican-American War including Palo, Alto, Monterrey, Buena Vista; and heroes like Jackson and Taylor. Many of the homes in the area are of the pre-Civil war Greek revival style.#13;#10;