allowing visitors to explore and learn about its history. you get directions to different historic attractions. it lets you explore more around the city, inspect information about each building, get who built it, when it was built. all those sort of things that you might be wondering as you're walking around, but you actually get to see that in a visual way. it's using google geospatial anchors. so, what that does is, it anchors the augmented reality experiences direct to pinpoint accuracy within the city. unlike similar apps, the technology being used here means visitors aren't forced to follow a set trail. they can go where they like and find out information along the way. on the ground there, on the cobbles, it says the new port gate. this is an old gate that used to block off the city. click on this coin, and then it recreates it in front of you. incredible. yeah. and this is part of a gamified element of the app, where you can actually collect the keys to it, and then lock the gates later on to sort of protect the city from invaders.