Many Americans arriving at Oxford ask, "Where's the campus?" If a local looks amused when answering, it's because Oxford University is, in fact, made up of 35 colleges sprinkled throughout the town. To tour all of these would be a formidable task. It's best to focus on just a handful of the better-known colleges.

A word of warning: The main business of a university is, of course, to educate -- and this function at Oxford has been severely hampered by the number of visitors who disturb the academic work of the university. So visiting is restricted to certain hours and small groups of six or fewer. Furthermore, visitors are not allowed at all in certain areas, but the tourist office will be happy to advise you when and where you may take in the sights of this great institution.

An Overview -- For a bird's-eye view of the city and colleges, climb Carfax Tower, located in the center of the city. This structure is distinguished by its clock and figures that strike on the quarter-hour. Carfax Tower is all that remains from St. Martin's Church, where William Shakespeare once stood as godfather for William Davenant, who also became a successful playwright. A church stood on this site from 1032 until 1896. The tower used to be higher, but after 1340 it was lowered, following complaints from the university to Edward III that townspeople threw stones and fired arrows at students during town-and-gown disputes. Admission is £1.50 ($2.40) for adults, £1 ($1.60) for children. The tower is open year-round, except for from Christmas Eve to January 1. April through October, hours are from 10am to 5pm daily. Off-season hours are Monday through Saturday from 10am to 3:30pm. Children under 5 are not admitted. For information, call tel. 01865/792653.

Christ Church -- Begun by Cardinal Wolsey as Cardinal College in 1525, Christ Church (tel. 01865/276150; www.chch.ox.ac.uk), known as the House, was founded by Henry VIII in 1546. Facing St. Aldate's Street, Christ Church has the largest quadrangle of any college in Oxford. Tom Tower houses Great Tom, an 18,000-pound bell. It rings at 9:05pm nightly, signaling the closing of the college gates. The 101 times it peals originally signified the number of students in residence at the time the college was founded. Although the student body has grown significantly, Oxford traditions live forever. There are some interesting portraits in the 16th-century Great Hall, including works by Gainsborough and Reynolds. There's also a separate portrait gallery.

The college chapel was constructed over a period of centuries, beginning in the 12th century. (Incidentally, it's not only the college chapel but also the cathedral of the diocese of Oxford.) The cathedral's most distinguishing features are its Norman pillars and the vaulting of the choir, dating from the 15th century. In the center of the great quadrangle is a statue of Mercury mounted in the center of a fishpond. The college and cathedral can be visited between 9am and 5:30pm, though times vary. It's best to call before you visit. The entrance fee is £3 ($4.80) for adults and £2 ($3.20) for children.

Magdalen College -- Pronounced Maud-lin, Magdalen College, High Street (tel. 01865/276000; www.magd.ox.ac.uk), was founded in 1458 by William of Waynflete, bishop of Winchester and later chancellor of England. Its alumni range from Wolsey to Wilde. Opposite the botanic garden, the oldest in England, is the bell tower, where the choristers sing in Latin at dawn on May Day. Charles I, his days numbered, watched the oncoming Roundheads from this tower. Visit the 15th-century chapel, in spite of many of its latter-day trappings. Ask when the hall and other places of special interest are open. The grounds of Magdalen are the most extensive of any Oxford college; there's even a deer park. You can visit all year round between 1pm and dusk daily. Admission is £3 ($4.80).

Merton College -- Founded in 1264, Merton College, Merton Street (tel. 01865/276310; www.merton.ox.ac.uk), is among the three oldest colleges at the university. It stands near Corpus Christi College on Merton Street, the sole survivor of Oxford's medieval cobbled streets. Merton College is noted for its library (which was closed at press time), built between 1371 and 1379 and said to be the oldest college library in England. Though a tradition once kept some of its most valuable books chained, now only one book is secured in that manner to illustrate that historical custom. One of the library's treasures is an astrolabe (an astronomical instrument used for measuring the altitude of the sun and stars) thought to have belonged to Chaucer. You pay £1 ($1.60) to visit the ancient library as well as the Max Beerbohm Room (the satirical English caricaturist who died in 1956). The library and college are open Monday through Friday from 2 to 4pm, and Saturday and Sunday from 10am to 4pm. It's closed for 1 week at Easter and Christmas and on weekends during the winter.

New College -- New College, Holywell St. (tel. 01865/279555; www.new.ox.ac.uk), was founded in 1379 by William of Wykeham, bishop of Winchester and later lord chancellor of England. His college at Winchester supplied a constant stream of students. The first quadrangle, dating from before the end of the 14th century, was the initial quadrangle to be built in Oxford and formed the architectural design for the other colleges. In the antechapel is Sir Jacob Epstein's remarkable modern sculpture of Lazarus and a fine El Greco painting of St. James. One of the treasures of the college is a crosier (pastoral staff of a bishop) belonging to the founding father. Don't miss the beautiful garden outside the college, where you can stroll among the remains of the old city wall and the mound. It's an evocative, romantic site. The college (entered at New College Lane) can be visited from Easter to October, daily between 11am and 5pm; and in the off season daily between 2 and 4pm. Admission is 50p to £2 (80¢-$3.20) (depending on what is open) from Easter to October and free off season.

The Old Bodleian Library -- This famed library on Catte Street (tel. 01865/277224; www.bodley.ox.ac.uk) was launched in 1602, initially funded by Sir Thomas Bodley. It is home to some 50,000 manuscripts and more than 5 million books. Over the years the library has expanded from the Old Library complex to other buildings, including the Radcliffe Camera next door. The easiest way to visit the library is by taking a guided tour, leaving from the Divinity School across the street from the main entrance. In summer there are four tours Monday through Friday, and two on Saturday; in winter, two tours leave per day. Call for specific times.