Original sentence: The hill also includes several iconic monuments and buildings: the National Monument, Nelson's Monument, the Dugald Stewart Monument, the New Parliament House (the Royal High School), the Robert Burns Monument and the City Observatory
Edited sentence: The hill also includes several iconic monuments and buildings: the National Monument, Nelson's Monument, the Dugald Stewart Monument, the New Parliament House (the Royal High School), the Robert Burns Monument, the Political Martyrs' Monument and the City Observatory