Aberdeen, Scotland is the country's third largest city and has a population of approximately 212,000 people. Aberdeen is the chief commercial center and seaport in northeast Scotland. Aberdeen is known as the Oil Capital of Europe, due to its supply of crude oil. Union Street is a famous roadway in Britain. Notable attractions are malls, churches, buildings, the National Bank of Scotland, and the music hall. There are no trams in Aberdeen; the last one is on display in the Transport Museum in Aberdeenshire. There are many churches, but only one is from the Middle Ages. There are several museums and art galleries, with art from different eras, as well as different media. One museum has a collection of 19th century art donated by the museum's first benefactor. There is a maritime museum, and the Provost Ross' House, which is the second oldest house in the city. The public library has 60,000 books, and His Majesty's Theater is the home for popular entertainers. It has a capacity to seat 1,500 and is one of the most popular in Britain.