The much-photographed, famous street shown in the picture is located in which U.S. city?

The street featured is Acorn Street, Beacon Hill, Boston, Massachusetts. It is a tiny one-block-long street located in the Beacon Hill area, an historic district of Boston retaining much of its original architecture dating from the early to mid-1800s.

The street is said to be the most photographed street in Boston and one of the most photographed streets in the U.S.. Its few homes, originally used to house the coachmen employed by families in the nearby Mt. Vernon and Chestnut St mansions, have assessed values that range from $2 million to upwards of $6 million. The street attracts so many visitors that it occasionally looks less like a part of a colonial village and more like a carnival attraction.

It is one of the last places in the U.S. to still have actual cobblestones as paving material. Real cobblestones are rounded but irregularly shaped stones, "cobs”, taken from the earth and used as they are naturally formed. The settlers extracted these and put them to use by creating cobblestone streets, which today are very rare and are considered to be historic treasures.

Acorn Street is one of the very few streets with its original cobs in place. Other streets are described as cobblestone, but it is more likely that these streets are paved with "setts"—quarried granite worked on to form more even surfaces. Cobblestones are not level and stick up out of the ground in uneven arrangements, much to the dismay of the horses and humans who have had to traverse them.