The Cologne Cathedral is a Gothic masterpiece and took more than 650 years to complete, beginning in 1248. The largest Gothic church in northern Europe, the Cologne cathedral was the tallest building in the world up until 1890 and still has some of the highest church spires in the world.
The cathedral was built originally to house the relics of the Three Kings, dating back to the 13th century, the reliquary is the largest in the Western world and believed to hold the remains of the Three Wise Men.
Situated centrally in Cologne, directly across from the main train station, you would be hard pressed to miss the cathedral. Cologne is also home to twelve impressive Romanesque churches including Gross St. Martins so if you want to experience more than just the Aachen cathedral and take in some of the other beautiful historic churches in the area you might want to start with Gross St. Martins which was the main church of Cologne for hundreds of years after being built in 960.