Fifth session of this NYU course. Five walks (Thursday afternoons, April 10, 17 and 24 and May 1 and 8) take us to Manhattan’s major monuments of art deco architecture.

The Upper East Side – Manhattan’s gold coast – maintains an aura of conservative respectability, and perhaps as a result never attracted as much Art Deco flash as its counterpart on the west side of Central Park. Nevertheless, tucked among the Beaux-Arts town houses and sedate neo-Georgian apartment buildings, the neighborhood has some remarkable examples by some of the city’s best architects of the period.

Reservations required. Tour of the Woolworth Building lobby, closed to the public for more than a decade and now open again. The tour includes a detailed look at the building’s unmatched polychromatic terra-cotta exterior, and an in-depth exploration of the lobby and its wealth of ornament, including hidden corners and staircases — plus a special visit to the mezzanine level for an up-close view of its extraordinary mosaic ceiling.

This tour, which includes the former Custom House, Steamship Row, Castle Clinton, Federal Hall, and the House of Morgan, will discover well-known highlights as well as some unexpected delights. From the spectacular skyline up in the air to archaeological relics down underground, Downtown remains one of the world’s great urban treasures, even as it rebuilds.