The oldest building in the world

The image discusses Knap of Howar, considered one of the oldest buildings in the world. Here are the responses to the questions:

1. **Where is it?**
Knap of Howar is located on the island of Papa Westray in Orkney, Scotland.

2. **How old is it?**
It dates back to around 3600 BC, making it approximately 5,600 years old.

3. **What is it made of?**
The building is constructed from local stone and features thick walls.

4. **How to get there?**
To reach Knap of Howar, visitors typically travel to Orkney by ferry or plane, then take a smaller ferry or a local transport service to Papa Westray.