The British Library has released freely available high quality scans of the Codex Alexandrinus' New Testament.

This is a ms. of the dates from the 5th century and is the most complete Bible from the early history of the Bible as text. The three "best" mss. are Codex Sinaiticus and Codex Vaticanus, and Alexandrinus, the only one that's also decorated with early Christian illumination, and it is the oldest text of the NT (though not the least error-free).

You can find the NT of Codex Alexandrinus at the British Library. The OT will eventually also be available.

Codex Sinaiticus is also available in high quality scans.

These documents are important for comparative reasons (there are phrases that are borrowed from other languages and religions, for instance) as well as for the history of writing.