Back Bay Fens is a 90-acre park in the city of Boston, Massachusetts. The park was designed by famed landscape architect Frederick Law Olmsted and is part of the Emerald Necklace, a 1,100-acre chain of parks that stretches from Boston Common to Franklin Park.

There are several good reasons to visit Back Bay Fens, including its beautiful gardens, walking paths, and numerous points of interest. Visitors can enjoy a stroll through the Kelleher Rose Garden, which features over 1,500 rose bushes, or take a walk along the winding paths that lead through the park's lush greenery.

Other points of interest in Back Bay Fens include the WWII Memorial, the Shattuck Visitor Center, and the Muddy River Restoration Project. The WWII Memorial honors the sacrifices of Massachusetts residents who served in World War II, while the Shattuck Visitor Center offers exhibits and information about the park's history and ecology. The Muddy River Restoration Project is an ongoing effort to restore the river's natural ecosystem and improve water quality.

Interesting facts about Back Bay Fens include its history as a tidal marshland that was transformed into a park in the late 1800s. The park was designed to provide a green space for the rapidly growing city of Boston and was originally known as "The Fenway." Back Bay Fens was also the site of a famous 1912 concert by Italian tenor Enrico Caruso, who performed for an audience of 50,000 people.

The best time of year to visit Back Bay Fens is during the spring and summer months, when the gardens are in full bloom and the weather is mild. The park is open year-round, however, and visitors can enjoy its scenic beauty and historical significance in any season.