To those from the Western hemisphere, it’s always fascinating to hear that some homes and businesses from the times of the Greek philosophers still have inhabitants, and then you remember that the Western hemisphere is itself not without its own examples, for example some Mexican villages still have temples from the times of the Mayans.
The oldest church was built around 1200, on the remains of an older church from the 7th century and you can go below ground to view those. We also have some Roman ruins from a castellum build around the year 47 you can also go and view.
Edit: The castellum is gone, but there are just some walls and stones.