Underground Bath (Baku)
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| Underground Bath | |
|---|---|
Azerbaijani: Yeraltı hamam | |
Location in the Baku Old City | |
| General information | |
| Type | Bath |
| Architectural style | Azerbaijani architecture |
| Location | Old City, Baku, Azerbaijan, 50 Boyuk Gala Street |
| Completed | 19th century |
| Official name | Walled City of Baku with the Shirvanshahs' Palace and Maiden Tower |
| Type | Cultural |
| Criteria | iv |
| Designated | 2000 (24th session) |
| Reference no. | 958 |
| Region | Asia |
| Endangered | 2003–2009 |
Underground Bath (Azerbaijani: Yeraltı hamam) is a hamam located on the Boyuk Gala Street, near the fortress gates of Icherisheher in Baku.

The baths premises are located below the ground level, which is typical for Baku baths. This helped to maintain a constant temperature regime. On the earth's surface, there were 2 domes with holes allowing the light to access inside.[1] The baths entrance was located in the southern part.[2]
The bath consists of several rooms and two octagonal halls. During the archaeological work, it was assumed that in the first hall, placed at the entrance, the visitors changed their clothes, and that the second hall was a bath space itself.[2]
During the construction, the gulbakh stone was used, one of the types of agglai. For insulation, a clay and limestone based mortar was used.[2]