WHAT: "Tall Buildings," at MoMA QNS, the Museum of Modern Art's temporary facility in Queens, N.Y.

WHEN: Now through Sept. 27.

WHY GO: In this major architectural survey of 25 structures, the focus is squarely on current trends and future possibilities. Drawings, photos and architectural models examine works -- some built, some in progress, some unrealized -- designed by Frank Gehry, Norman Foster and other top names.

DON'T MISS . . . the interesting but discarded ideas for the World Trade Center site, as well as Adrian Smith's 1998 proposal for 7 S. Dearborn St. in Chicago. At 2,000 feet -- nearly 50 percent higher than the Empire State Building -- the unbuilt structure would have been the world's tallest building. ADMISSION: $12.

EXTRAS: New York is home to a couple of projects by featured architects. Rem Koolhaas's Prada store in SoHo (575 Broadway at Prince Street) is a futuristic emporium, while Santiago Calatrava's time capsule near the American Museum of Natural History at 79th Street and Columbus Avenue is a stainless-steel flower that will open in 3000. If you're still high on tall buildings, check out the Skyscraper Museum at its new home in Manhattan's Battery Park (39 Battery Pl., 212-968-1961, www.skyscraper.org).

PACKAGES: Hilton properties have a "MoMA/Amtrak" package that includes lodging, two tickets to the show and Amtrak Guest Reward points. Participating hotels include the Waldorf Astoria (from $269 per night), the Embassy Suites (from $219) and the Hilton New York (from $229). Details: 877-NYC-HILT, www.hiltonfamilynewyork.com/specials.php. Amtrak has a separate special offering 20 percent off some tickets between Washington and New York. Details: 800-USA-RAIL, www.amtrak.com. Use promo code V873 when buying online. Deal not valid on the Acela.

INFO: MoMA QNS (33rd Street at Queens Boulevard, 212-708-9400, www.moma.org).

-- Seth Sherwood