RFID has been traditionally used for tagging moving objects. In this poster, we explore using it to tag and annotate fixed struc- tures like buildings and even city infrastructures. Based on the as- sumption that in order to avoid tampering and vandalism, the RFID tags could be implanted in building materials, we perform the read- ing performance measurement with RFID tags buried in concrete bricks. We find that the reading distance is decimated to a few cen- timeters, both in the completely buried case and the exposed case. The implication is that the intended application is immediately pos- sible for mobile robots that can place the RFID reader a few cen- timeters above the floor while navigating. But for human users, the reading distance should be much longer. In future, we will inves- tigate how we can extend the reading range of the passive RFID tags even when they are attached to or embedded in the building materials.