St Mary's Tower in Dundee, United Kingdom is the oldest building in the city, dating back to the late 15th century. It's part of the City Churches complex, which includes St Clement's Church, Old St Paul's, and St David's Church. The tower has some serious history vibes and is definitely worth checking out if you're into old-school architecture and cool historic sites. Plus, it's right in the city center, so you can easily swing by while exploring Dundee.