Recently we were contracted to build a few bookshelves. Massive bookshelves, approximately 10 feet tall.
These were designed and built into the wall by one of our skilled carpenters.
To start:
Bookshelf in Front Sitting Room:
In the Back Sitting Room there were two sets of bookshelves. One had a built in TV nook.

Bookshelves in double parlor. Each of these shelves were approximately 5 feet tall.
Final set of built in bookshelves in Upstairs Hallway:
And finally a few of the built in detail bits:
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Many thanks to Noel and Baby N. for posing for scale photos!
Wow! Stunning!
Very impressive!