Hell (Right panel of tryptich, The Garden of Earthly Delights); Hieronymus Bosch
Link is to downloadable file on Wikipedia, which also has a page devoted to the entire work. Original is in the Museo del Prado, but they don’t offer a high resolution version on their site.
There is a high-resolution file of the entire triptych, The Garden of Earthly Delights on Wikimedia Commons, but be aware that the main file is over 300mb. The image is also offered divided into a series of smaller high-resolution tiles.
Paintings like this were meant to strike fear into the minds of those who viewed them, showing the horrors of eternal damnation that would inevitably follow their unwise choices.