TWC NEWS VIDEO: Every city has its wealthy, but in 1901, Buffalo's industries were a recipe for greatness, and the city's millionaires and its mansions rivaled New York City.

Buffalo was the 8th largest city in the country and had 60 millionaires, more per capita than any other American city, and Delaware Avenue became where the wealthy settled.

During the 1880s and 1890s, Delaware became known as Millionaire's Row, with architects brought in who were designing homes elsewhere for Vanderbilts and Astors.

But as with many areas of splendor, things changed. After World War II, families moved away and many of the mansions of grandeur were demolished, turned into apartments, or bought by businesses. Many mansions, like the the Clement House, were donated to charities.

In 1974, the Delaware Avenue National Historic District was added to the National Register of Historic Places. Today, the two block-long district is the only surviving segment of the mansions of old.