I am spending a day in Raleigh. Anything worth seeing or doing there?

No. Those of us who live here go to neighboring towns in order to do or see anything. :-<

Okay, Diana, then how about sharing which neighboring town(s) ???

The North Carolina Museum of Art in Raleigh is a wonderful museum. It was always included in our "to do" things when we visited our daughter in that area. Don't miss the Georgia O'Keefe painting. Every traveling exhibit was well worth seeing. The museum is not huge and overwhelming.....very well planned with a nice cafe for lunch.

I just checked the N.C. Museum of Art web site. It is closed Monday and Tuesday. Open Wed-Sat. 9-5, Sun. 10-5. Free admission.

I live in this area, and honestly, I always have a hard time coming up with sights that I know will be interesting to most travelers. If you could name a few of your interests, it might help. Good things to see and do (in general): walk around the state capitol in Raleigh (nice old houses around this area). The history museum by the capitol has a nice Civil War exhibit, and you can see a few dinosaur skeletons across at the science museum (both are free) - the rest of the museum is not all that great if you don't have kids. Visit the college campuses at UNC-Chapel Hill (Franklin Street is nice), and Duke (in Durham - Duke Chapel and Duke Gardens are worth seeing). The art museum is a good idea if you like art. It is not near downtown but actually right off Hwy 40 toward Chapel Hill and Durham, so you could combine the museum with a visit to UNC and Duke.

I believe Diana was being sarcastic, because well, really, the OP invited it. Raleigh is a state capital city and a city of nearly 300,000 people. Of COURSE there are going to be things to see and do there.

Now, to be specific, Raleigh's glory is its museums. There are a clutch of state museums that are absolutely top notch, including the North Carolina Museum of Art, mentioned by katybird. Also, the North Carolina Museum of Natural Sciences and a museum of state history are well worth seeing, as is the Executive Mansion (the governor's mansion), which has been called the best example of Queen Anne architecture in the country.

Meanwhile, downtown Raleigh is a nice place to walk around, even though it is a bit sleepy. Make sure to see the Capitol, which although deceptively plain on the outside, is lovely inside. Raleigh's Victorian district is called Oakwood and is a nice place to see the "painted ladies" most people dream of living in. Also, Glenwood South is a hip neighborhood with some interesting street life.

I'm sure someone a bit closer to Raleigh than I am can give more details on the museums -- especially since I'm sure I've left out a few -- plus all the cultural offerings, lakes, city greenways, and state parks available in the capital city.

And of course... there's also Durham and Chapel Hill nearby, both of which are worth a look.