 Today, the Hwanggungu (hwang-gung-u, 皇穹宇, Imperial Vault of Heaven), a three-storied octagonal shrine built in 1899, remains at the site.The Hwanggungu, built on the north side of the altar complex, was designed for the worship of Heaven and respecting Taejo, the founder of Joseon.Along with the Hwanggungu, there are several other surviving relics such as the three stone drums (Seokgodan, 石鼓壇) featuring dragon decorations completed in 1902 to commemorate the 40th anniversary of Gojong's enthronement, the gate leading to Hwanggungu, and the main entrance into the complex.