Peter Derrick, MTA veteran and the author of Tunneling to the Future: The Story of the Great Subway Expansion That Saved New York, on the Transit Museum in Downtown Brooklyn.

Robin Nagle, author of Picking Up and the anthropologist-in-residence at NYC's Department of Sanitation, on the Newtown Wastewater Treatment Plant in Greenpoint.

Olga Sooudi, an anthropologist at the University of Amsterdam and the author of Japanese New York: Migrant Artists and Self-Reinvention on the World Stage, on the Noguchi Museum in Long Island City.

Steve Lang, professor of urban studies at LaGuardia Community College, CUNY and the author of “Striving for Sustainability on the Urban Waterfront,” on the Newtown Creek Alliance.

Margaret Oppenheimer, author of The Remarkable Rise of Eliza Jumel, on the Morris-Jumel Mansion in Washington Heights, Manhattan's oldest house, famed for its notable inhabitants General Washington and Aaron Burr.

David Gary, curator at the American Philosophical Society, on King Manor, in Jamaica, Queens, the home of Alexander Hamilton's "right-hand man," the influential Federalist and early antislavery leader Rufus King.

Simon Baatz, John Jay College historian of crime and science in the 19th and early 20th century, on Jefferson Market Library, the Victorian Gothic courthouse in Greenwich Village.

Marjorie Feld, author of Lillian Wald: A Biography, on the famous Progressive reformer’s Henry Street Settlement, celebrating its 125th year of offering social services, art, and health care to the immigrant families of the Lower East Side.

May Joseph, professor of social science and cultural studies at Pratt Institute, and the author of Fluid New York: Cosmopolitan Urbanism and the Green Imagination, on Governors Island.

Don Hawkins, "dean of Washington, DC architectural history," on the early city hall remodeled by Pierre Charles L'Enfant for the seat of America's first government, on Wall Street.