Here are my submissions for the AS challenge "Medieval back and Forth".
My environments are based on tourism.

In the first environment, people from the future can travel back in time to participate and see people executions while they're eating some good fast food from the Big Boar Inn, or just visit a typical medieval village with the Tour bus.

In the second one, travelers from medieval times can enjoy the Ski Resort of Courcheval and rent some "snow sliders" in a brutalist building adapted to make them feel a bit more like home and where draft horses are making ski lifts work.