"TREASURES FROM THE FITZWILLIAM MUSEUM" go on display March 19 at the National Gallery of Art in Washington.

The show features more than 160 objects from the museum in Cambridge, England, including paintings by Titian, Guernico, Rubens, Hals, Van Dyck, Hogarth, Renoir and Degas. There are also drawings by Rembrandt, Tiepolo, Blake and Modigliani and illuminated manuscripts, ceramics, coins and medals, and bronzes.The subtitle of the show, "The Increase of Learning and Other Great Objects," refers to Lord Fitzwilliam's bequest in 1816 of his collection to Cambridge University "for the purpose of promoting the increase of learning and other great objects of that noble foundation."

The National Gallery of Art (Fourth and Constitution Streets, Washington, D.C. 20565; 202-842-6353) is open Monday to Saturday from 10 a.m. to 5 p.m. and on Sunday from noon to 9.

The exhibition ends June 18. Admission is free.

THOMAS HART BENTON'S 100th birthday will be marked by what the first major retrospective of his paintings and murals, at the Nelson Atkins Museum of Art in Kansas City, Mo., from April 16 to June 18. The realist artist was born in Missouri.

There will be 85 works altogether, including "Persephone," "The Romance" and "Bootleggers." The museum (4525 Oak Street; 816-561-4000) is open Tuesday to Saturday, 10 a.m. to 5 p.m. and Sunday from 1 to 5 p.m. Admission is $3.

There will be a lecture series on Benton during the display and a variety of other activities around Kansas City paying tribute to him;the Convention and Visitors Bureau (800-767-7700) has information. The exhibition will travel later to Detroit, New York (the Whitney) and Los Angeles.

PASSENGER'S ON ALL CONTINENTAL AIRLINES flights originating from Denver's Stapleton International Airport will be charged an additional $4 for their tickets as of March 15, according to the airline.

The surcharge reflects the Denver city government's raising its fuel tax on the airlines from two cents to four cents a gallon on the first of this month, Continental said.

The tax was raised to get funds for a new airport to be built 18 miles northeast of downtown Denver by 1993.

Continental has objected to plans for financing the new airport, saying too much burden will be on the airlines, who will have to raise ticket prices.

A spokesman for the city, Richard Boulware, said that Continental's surcharge is "a public relations gimmick" to mobilize passengers against the new airport.

Continental and United Airlines, with their regional airlines, account for 89 percent of passengers flying out of Stapleton, and the airlines do not want a larger airport that will allow others to compete, according to Boulware.

A United spokesman said that United was reviewing a surcharge of its own but had not made a decision.