隐秘层级-“地下室”(8)

"Creepy Basement Tunnels Through Dirty Window" 作者为Aoife city womanchile，遵守CC BY 2.0协议。
https://www.flickr.com/photos/98451485@Nhttps://wimgs.ssjz8.com/upload/00/1534986144
"snapper attack" 作者为Barbara Eckstein，遵守CC BY 2.0协议。
https://www.flickr.com/photos/12368786@N06/5993895714

"Guastavino tile arch ceiling in basement, construction of the McKim Building" 作者为波士顿公共图书馆，遵守CC BY 2.0协议。
https://www.flickr.com/photos/24029425@N06/2388350648