I've been there, and it's one of the most amazing manmade things I've ever seen. Looks like a UFO with a city on top of it just landed on a flood plain. Once you're in the town, you feel like you're in Gondor or Helm's Deep.
This. It's amazing to sit there and watch the tide come in as well. And nobody (when I was there) was walking around at night. It's other-worldly.