Dublin enjoys one of the loveliest natural settings in Europe. Dublin attracts visitors from around the world with its old world charm and friendly atmosphere. Most of the architecture dates from the 18th century, when Dublin enjoyed great prominence and prosperity. Also of interest are stately Georgian houses which front Merrion Square. O'Connell Street is considered the commercial center of Dublin. Perhaps the most memorable feature of Dublin is the traditional pub, where visitors can enjoy conversation over fine Irish brew. The city also offers many fine parks, including St. Stephen's Green and Phoenix Park. National Gallery's renowned collection includes works by such famous masters as Rembrandt and Monet. Trinity College's Old Library is home to the most cherished treasure, the Book of Kells, a manuscript of the Gospels. Admire Christ Church Cathedral and St. Patrick's Cathedral. Enjoy the exhibits in impressive National Museum. Self-guided walking tours include Old City Trail, Georgian Heritage Trail and the Cultural Trail.