If you are a book nerd - welcome to your mecca. Marsh's Library is the oldest public library in the country and holds over 25,000 books and 300 manuscripts!The library is also filled with other interesting parts of Dublin's history. For example, there are bookcases with bullet holes from the EasterRising, and three wired alcoves that were used to prevent book theft in the 18th century that were used by locking the reader inside to use the library's rarest books.
This was the library in Dublin I wanted to see the most as I love old books. It's tiny and full of supremely old books of every shape and size. When I visited they had an exhibit of books detailing maps and stories from when America was just being explored. The staff were even more delightful - completely willing to just stand around and chat about anything and everything.
Hearing the name of this library before I came, I thought it was very big.