Aachen Altar Aachen Altar The Aachen Altar (de: "Aachener Altar") or Passion Altar ("Passionsaltar") is a late gothic passion triptych in the Aachen Cathedral Treasury, made by the so-called Master of the Aachen Altar around 1515/20 in Cologne, Germany. The open, three winged polyptych altar image shows scenes from the Passion of Christ to his Ascension in continuous sequence from left to right. At the assumed time of composition, this type of depiction was already well-established. On the left wing of the altar, Jesus is crowned with the Crown of thorns and confronts Pontius Pilate. The central panel depicts the Stations of
Circular Mound Altar because of the high durability of the materials used to build this piece of architecture. The walls are now layered with marble and the rest of the altar consists of the initial material used for construction, blue-stone. Marble is an important material to use as it helps to create the echo used to amplify sound due to its extremely smooth surface. Circular Mound Altar The Circular Mound Altar (圜丘坛 huán qiū tán) is an outdoor empty circular platform on three levels of marble stones, located in Beijing, China. It is part of the Temple of Heaven. It was constructed in