underground structure

man-made underground structure

en-US/ˌʌndɚˈɡɹæʊnd ˈstɹʌkt͡ʃɚ/
en-GB/ˈʌndəɡɹaʊnd ˈstɹʌkt͡ʃə/

श्रेणियाँ:

architectural structuresubterranea