Iceland has waterfalls like no other | Nauthúsafoss, Iceland [7820x5216] [OC]

Seruni Point Indonesia [1920x3415] (OC)

Lupine in the High Mountains, Beartooth Mountains, Wyoming [OC] [5000x3143]

Upper Cathedral Lake, Yosemite National Park, CA, USA | 1366 x 1025 | OC | IG: @thelightexplorer

Sunset at Varadero, Cuba [OC] [4000x3000]

Beautiful reflection in Mount Rainier National Park, Washington [OC][1209x1800]

Pisgah National Forest (OC) (3024x4032)

Storm over cathedral ranges national park, VIC Australia [1080x1350] [OC]

Half Dome from Clouds Rest, Yosemite National Park, CA, USA | 1500 x 1125 | OC | IG: @thelightexplorer

Scout Falls and all its layers, below Mt Timpanogos, Utah [OC] [2560x1925]

I went exploring in a few abandoned buildings today and found this. Can anyone help me identify it?