All that survives from the Sutro Baths is the concrete foundation of the old bath house. These ruins are located along the Pacific coast of San Francisco. I was attempting a long-exposure photo to smooth out the waves crashing against the rocks just off the coast. However, in bright mid-day sun, even with the Vari-ND filter set to maximum (10 stops) and the aperture at f/32, the shutter speed was only a short 20 seconds.
Nikon D800, Nikkor AF-S 28-300mm f/3.5-5.6G ED VR, 62mm, ISO 80, f/32, 20.0s