Google describes World Wonders Project as a project that enables you to discover 132 historic sites from 18 countries, including Stonehenge, the archaeological areas of Pompeii and the ancient Kyoto temples. In addition to man-made sites, you can explore natural places: wander the sandy dunes of Australia’s Shark Bay or gaze up at the rock domes of Yosemite National Park in California.
Here's a promotional video.
And here's a screen shot that shows what the site has in store for us:
First of all, you have to choose the language you wish to view the site. You can find the language options in the bottom right hand corner.
Then you have two options to spot the sites of your interest, "Find by location", "Browse by themes".
Finally, when you get to the site you wish to visit, you come across a menu with four options, "Information", "Videos", "Photography" and "3D-models". On top of that, you can have a virtual tour of the site.