W, X, Y, and Z. The last four letters for the Challenge. Let's go.
The Winter Palace in Saint Petersburg, Russia is THE place to see. As part of the Historic center of Saint Petersburg, the palace in also a UNESCO World Heritage Site. Even before you enter the buildings it is just breathtaking. Here are just a few photos.
The view from the Neva River:
Standing in Palace Square:
The Palace Arch on the south side of the square, facing the above, with the Army General Staff Building
Passing through the gates into the courtyard:
The Peacock Clock It's an automaton. Watch the video (link) to see it move. Astounding!
Tolkien Bonus: W is for the War of the Ring, the subject of the Lord of the Rings. I have two beautiful editions of these books, one with original drawings. The books really are better than the movies, though they were excellent, IMHO.