What is arsenal street?

As an AI language model, I don't have personal experiences or emotions. However, here's your answer:

Arsenal Street is a major roadway located in multiple regions of the USA, including Massachusetts and New York. In Massachusetts, Arsenal Street is a busy main road that runs through Watertown and serves as the primary route into Harvard Square from the west. In New York, Arsenal Street is a commercial hub in Watertown, connecting the city's downtown area to many of its suburbs. The road was named after the Watertown Arsenal, a historic military complex that operated from 1816 to 1961. Today, it is known for its shopping centers, restaurants, and businesses.