The Broch of Mousa is a super old tower in Scotland that's surprisingly well-preserved. It dates back 2,000 years to the Iron Age and stands tall on the island of Mousa. No one knows for sure what it was used for, but it might have been a lookout tower or a fancy home at some point. People back in the day probably climbed its winding stairs to check out the sweet views of land and sea. Nowadays, it's a cool spot for birdwatching, especially for storm petrels. Plus, there were otters living there at one point—how cute is that?