Frederick Law Olmsted National Historic Site is located in Brookline, Massachusetts and is dedicated to the preservation of the legacy of Frederick Law Olmsted, the father of American landscape architecture. The site includes Olmsted's former home, studio, and headquarters of the Olmsted firm.

One of the main reasons to visit the site is to learn about the life and work of Frederick Law Olmsted, who designed many famous parks and public spaces in the United States, including Central Park in New York City and the Emerald Necklace in Boston. Visitors can take a guided tour of Olmsted's home and studio to see his personal belongings and learn about his design process.

Other points of interest include the extensive gardens and grounds surrounding the site, which showcase Olmsted's approach to landscape design. There are also several exhibits and programs that explore Olmsted's influence on American culture and society.

Interesting facts about the site include that it was once used as a training ground for the U.S. Army during World War II and that Olmsted's son, John Charles Olmsted, carried on his father's legacy by continuing to design public spaces after his father's death.

The best time of year to visit the site is in the spring and summer when the gardens are in full bloom and the weather is pleasant for outdoor exploration. However, the site is open year-round and offers indoor exhibits and programs during the colder months.