In the spa town of Aachen on the Western edge of Germany lies the Aachen Cathedral, the resting place of the great Emperor Charlemagne, who unified Western Europe and is referred to by some as the father of Europe. It also houses a number of significant Christian relics.
The Aachen Cathedral serves as the seat of the diocese of Aachen. Construction was started by Charlemagne in the late 8th century; it is considered the oldest cathedral in Northern Europe. Charlemagne was buried there in 814 AD. More of its history and a 3-D tour of this amazing site can be explored here.