Various resources studying and documenting the many complex infrastructures that sustain urban life.

NYC Subway A site dedicated to the history of the New York City Subway system, including photos, maps, and documents.

Underground Scene: New York’s Subway Back in the Day Photographs from LIFE’s collections documenting the way that the subway looked, worked, and felt, in the middle of the 20th century.

Geologic City An ongoing exploration of NY’s geologic history and present.

Urban Omnibus Online publication of the Architectural League of New York with a number of series on infrastructure: City Habitats, Cleaning Up?, The Location of Justice