Ask HN: App idea for travellers

While on holiday last week, I went on a day trip to see Antwerp, Belgium. There was no way we were going to be able to look up and discover all there was to see on our own, so we decided to do the touristy thing and take the one hour tour bus.

As we were driving around, the tour guide was telling us about each sight and providing a little info about each attraction. At some point during the tour, I thought to myself how nice it would be to come back and see all these places my self, while riding around on a bike or walking around. But there was no time to write every thing down. Then I realized it would probably also involve looking up each attraction on the web and plotting my trip on a map and would eventually become this whole to-do. I thought to myself how nice it would be if I have my own little tour guide to guide me around - I just pick the city, arrive and he takes me through it. He tells me where all the nearest tourist attractions are based on my position and provides me with directions and a brief overview of each atraction so I can walk / cycle there and take a look if I want.

That's when it dawned on me, this would probably make a good app. It's kind of like GPS, but more for tourists walking / cycling around. I could just rock up in a city and start browsing attractions based on the suggestions from the app that sounded good to me. It could give me a brief history / overview of the attraction, directions and even a link to the website if I wanted to research further.

So, before I pretend like that I'm the only person to ever think of this, let me ask - are there any apps like this already? Any good ones? Recommendations? As a new but regular traveller, I really hate planning every little stop or checking maps before the time. It would be great to just arrive somewhere and start exploring from there, with some knowledge of what was around me and take things at my own pace with my virtual tour guide (audio preferably so you dont have to have your head buried in your phone the whole time) helping me along the way.

If there isn't anything along these lines, what do you think of the idea? It would mainly be for travellers so I'm not quite sure non-travellers would see the need (I may be wrong). Does this have merit?