Holy Family Cathedral was built in 1914 and remains one of Tulsa's well-known landmarks. It was designed in the Gothic Revival style and was the tallest structure in the city when completed. Its three spires represent the three members of the Holy Family; the tallest one reaches a height of 251 feet. Other notable features include stained-glass windows and one of the largest Gothic altars in the country. The cathedral was added to the National Register of Historic Places in 1982.