Shh . . .get out of all the city's hustle and bustle for free, right in the shadow of the Washington Monument. Our nation's oldest music library – now part of Johns Hopkins University – is one of the largest. Its holdings include some of the rarest and earliest musical manuscripts, as well as sound recordings in every format. The public is welcome; books are brought to the reader by librarians. But it's the interior itself that's stunningly beautiful. Flooded with natural light from the skylight and adorned with Corinthian columns, this library is actually an extremely popular local wedding site. During the summer, as a matter of fact, the library's only open on weekdays.