Here's the "marvelous" arch: https://commons.wikimedia.org/wiki/File:Yonaguni_Monument_Arch.jpg https://commons.wikimedia.org/wiki/File:Yonaguni_Monument_Ar...

Here's the "marvelous" arch: https://commons.wikimedia.org/wiki/File:Yonaguni_Monument_Arch.jpg https://commons.wikimedia.org/wiki/File:Yonaguni_Monument_Ar... And the "staircase": https://commons.wikimedia.org/wiki/File:Yonaguni_Monument_Main_Terrace_Stair.jpg https://commons.wikimedia.org/wiki/File:Yonaguni_Monument_Ma...