underground structure

man-made underground structure

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

ক্যাটাগরি:

architectural structuresubterranea