Houston Street — that's HOW-stun, for the first-time visitors — has seen many changes since it was mapped as the southern boundary of Manhattan's famous street grid under the Commissioners' Plan of 1811. In fact, the 1811 plan was the first time the street, named for William Houstoun, was spelled "Houston." The misspelling stuck. Houstoun was the Georgia-born son of Sir Patrick Houstoun, a Scottish aristocrat and member of the state's colonial Government. The younger Houstoun represented Georgia at the Continental Congress and Constitutional Convention of 1787, where he met Mary Bayard, of the prominent Manhattan family, whom he married in 1788. The original segment of Houstoun's namesake street was part of the Bayard family's property. Over the ensuing decades, Houston was merged with neighboring thoroughfares (North Street on the east side; Hammersley Street on the west) until it spanned the breadth of the entire island. This walk covers the tumultuous early decades of the 20th century, when subway construction and increased automobile traffic molded Houston into its current form. Let's take a look!