I went on a Monday morning and didn't purchase my ...

I went on a Monday morning and didn't purchase my ticket til two hours beforehand. There wasn't a line and I was able to walk right in at 10:30AM. If you're visiting at a busier time plan ahead but it's definitely worth a visit.

I paid the extra 5 for the audio tour and it was very informative. A little over the top some times but worth the extra.

A plea to the people who take pictures, even though they ask you not to, please turn off the flash. This is the whole reason they say no pictures in the first place, the flash is bad of the art work and can ruin the experience for others.