While Manhattan's streets were largely laid out with the Commissioners' Plan of 1811, this grid system was only implemented between Houston and 155th Streets. The plan left Greenwich Village with its long-established mews, alleys, and courts, many of which date to the city's early colonial period, intact. While not exclusively in the Village, most of the secret streets on this list are located there among the organically developed 18th-century street plan. While some changes have come to these streetscapes in the last century, in most cases their concealment and a healthy dose of historic preservation work have aided in their continued survival in the 21st century.

Milligan Place is a small alley off of Sixth Avenue, one of a number of hidden alleys in the Greenwich Village. Named for Samuel Milligan, the original owner of the property, the alley is lined with brick homes constructed in the 1850s. Today the small alley looks much like it did in this circa 1915 photograph and likely just as it did in the second half of the 19th century, quietly tucked away from the busy nearby street.

Milligan Place, March 20, 1936. Named for Samuel Milligan, whose home originally stood on the site, Milligan Place’s four houses were built in 1852 by Aaron Patchin, Milligan’s son-in-law, who owned nearby Patchin Place. Like Patchin Place, Milligan Place attracted bohemian tenants, such as George Cram Cook, co-founder of the Provincetown Players, and his wife, playwright Susan Glaspell. After 1917, the houses were modernized and subdivided into apartments. Abbott allowed the bright sunlight to impose a graphic pattern on the awkward space of Milligan Place, with the deep shadow of the El filling the foreground and the craggy branches of a barren tree filling the middle ground. The man standing at the apex of the triangular walkway cooperated with the photographer; a variant image shows that he walked into space twice. Threatened with demolition by a new owner, Patchin Place and Milligan Place were granted landmark status in 1969.