What does the app offer?
First, the app lists all the important information for your visit: hours, prices, directions, dining, and contacts. Furthermore, an adventure tour is available for download, ready to be used offline and on site. You can listen using headphones or by holding your smartphone to your ear, the way you would for a phone call. It's best to download the app while you're still at home and to take a peek at the monument. That way, you can start your visit as soon as you arrive on site.