St. Charles Avenue is a thoroughfare in New Orleans, Louisiana, U.S. and the home of the St. Charles Streetcar Line. It is also famous for the dozens of mansions that adorn the tree-lined boulevard for much of the uptown section of the boulevard. The Southern live oak trees, plentiful in the historic Garden District, were planted during the early twentieth century. Similar additions were made on other major New Orleans streets, such as Carrollton Avenue, Napoleon Avenue, and part of Canal Street, becoming one of the city's most memorable features.