Google’s Google Maps Views. You can go back to the old UI by clicking “Return to classic Panoramio”.

“We’ve made photos the hero on the page while still keeping the important features that people enjoy. On the photo page, by far the most popular on the site, we’ve made the photo over three times bigger! We’ve also made thumbnails on the profile page and the world map significantly bigger. We know that Panoramio members have used the existing design for years, so the ‘classic’ version will still be available for a little while,” mentions the Panoramio blog.