Built a few years ago by Constantine, in the 4th century.
The Kaiserthermen, or Emperor's Baths. These are original Roman ruins. They were closed when I got there, so I glanced around, and then climbed the wall. It was worth it.
Detail of the Cathedral of Trier.
The Liebfrauenkirche (Church of Our Lady).
An ancient bicycle, thought to be from Roman times.
The Porta Nigra, or "Black Gate." Another original Roman ruin. It has its name from the effects pollution has had on it over the centuries.
Witches need church, too.