The Regicides Trail is a historical walking path located in Massachusetts, specifically in the towns of Cambridge and Watertown. It commemorates the journey taken by the regicides, a group of judges who signed the death warrant for King Charles I of England in 1649. After the monarchy was restored in 1660, these judges faced execution, prompting them to flee to the American colonies. The trail features several significant sites related to the regicides, including the homes where they lived and the locations where they were captured. It serves as a reminder of the political turmoil of the time and the impact of the English Civil War on early American history.