The Liebfrauenkirche (The Church of our Lady) Trier, Germany

The sun came through the windows the morning that I walked into this church and I was blown away. One of the prettiest churches that I have ever been in. The placement of the windows was perfect.

Porta Nigra, Trier, Germany

According to Wikipedia, Porta Nigra is the oldest Roman gate north of the Alps. The gate is quite impressive as you walk through a shopping area to get there and it doesn't blend in with the surroundings.