Interestingly, today's Daily Prompt asks whether there is anyplace we wouldn't want to go. I immediately thought "Mercury" because of a wonderful story by Ray Bradbury. In the story, everyone lived for a very short time because of the atmosphere on Mercury; it was impossible to be outside in the day because of the planet's proximity to the sun and the cold was equally as deadly at night. Wasn't a place I wanted to go, based on all that. However, another review of the prompt suggests that we were supposed to focus on places more local: on this world. That changes things entirely, since I have not as yet been everywhere on this rock; my ability to make such a judgement is therefore limited. I suppose if forced to give an earthly answer, I'd have to say to the hydrothermal vents in the ocean.