The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From UIEvolution, Inc.:
Exotic Madrid, Spain... center of Spain and home of some of the most amazing museums in the world. Come discover all that Madrid has to offer in this special application that takes you through the common and uncommon sights of this amazing place. "Top 25: Madrid", brought to you by the emerging 'Top 25' series by UIEvolution, is an interactive application that allows you the chance to discover, read, and plan your trip. With an easy-to-use instant phone call feature, you can quickly call landmarks and begin researching and possibly planning your trip to Spain! And once you visit, you can start bragging to all of your friends and family on where you've been with the easy-to-use Facebook integration! Come discover more about Madrid with Top 25: Madrid!