Oldie, but goldie. The Blue Lagoon, not in Iceland, but in the constellation of Sagittarius, Messier 8 (M8), the Lagoon Nebula. Remote acquistion at the IAS Observatory, Hakos, Namibia.

More details at Astrobin.

IAS – Internationale Amateursternwarte e.V. – Hakos Observatory, Namibia
IAS remote telescope
Lacerta 12″ Newton f/4, ASA DDM85XL-A, QHY268M, Baader RGB SII Ha OIII 6.5 nm filters
39x R, 40x G, 40x B 60s, 59x Ha, 74x OIII, 73x SII 180s, mode 1, gain 56, offset 10, -5C, 20 flats, 30 darks, 50 bias
Total time: 44220s / 12h17
Data acquisition: IAS remote team / Martin Junius
Data calibration/integration: PixInsight WBPP
Image processing: PixInsight, BlurXTerminator, NoiseXTerminator, StarXTerminator, Photoshop, Lightroom