The Palace Castle Corridor was originally opened to the public in 1912, and was later changed to a private Palace Hot Spring Center. The water outlet in the corridor is only for residents to drink. Although the spring water of the Shang Palace Castle Spring is no longer available, it can still be transferred to the Art Nouveau-style pavilion in the Palace Castle Corridor. The Palace Castle Corridor was first built in 1910 and designed and built by Vienna architect John Friedrich Orman. The upper Palace Castle Spring in the Palace Corridor and the lower Palace Castle Spring in the Market Corridor are the same spring eyes, but the terrain is different, the taste and temperature of the hot spring are slightly different.