Netherland Plaza

I'm in Cincinnati for this, staying at the Hilton Netherland Plaza Hotel.

It is the most well-preserved and maintained Art Deco hotel that I've ever seen. Somehow it escaped the hands of stupid renovators over the years.

Bonus for Graecophiles: the ceiling of its Palm Court restaurant has paintings of Apollo and Artemis. In fact, the entire restaurant (formerly the lobby) has preserved intricate metal, wood, and ceramic decorations that are just breathtaking (click picture to enlarge):

(Photo from Chris Glass, who also links to this article.)

If you're staying in Cincinnati and love Art Deco, you will love this hotel.