"A World of Foreign Lands" at the Walters Art Gallery celebrates 1492 by capturing the spirit of the age of discovery through maps and books that reveal man's growing knowledge of the world from the Middle Ages through the 17th century. It also shows that misconceptions about the nature of foreign lands and peoples persisted; there are pictures here of people with four eyes and six arms. Enlightening and fun, this is an exhibit demonstrating that while knowledge moves forward the defeat of ignorance is long and slow. At the Walters Art Gallery, 600 N. Charles St., through Oct. 4. Call (410) 547-9000.