Lots of websites disappear because their domain names expire. Domain names (such as theanswerbank.co.uk, diy.com, etc) aren't owned in perpetuity. In reality they're only 'rented' because the registrant needs to renew them every two years. Further, websites need to be hosted on servers, with the site owners having to pay for the service. (So if they don't keep up their subscription their sites get taken down).
The domain name 'aqueltorremolinos.com' is still a valid one though. It's currently 'owned' (i.e. 'rented') by a Romanian guy called Milen Radumilo but it seems that he's no longer interested in running the site (or possibly unable to afford the hosting fees), so he's put the domain name up for sale (for anyone who's got US$688 and who happens to want such an obscure address).
So it looks like the site has gone forever. If you want to ask Mr Radumilo what happened to it, try emailing him:
[email protected]