Tesla coils, in various states/conditions.
The drawings of pioneering neuroscientist Santiago Ramón y Cajal. The 1906 Nobel prize winner detailed the microscopic, serpentine arborizations of brain cells, among other exploits. As a precocious 11 year old boy, he also managed to raze his neighbor’s gate with a homemade cannon.
Angel Falls, the most towering and precipitous of all waterfalls.
Although the summit of Everest is at a higher altitude, K2 is a more difficult and dangerous climb, due in part to its more inclement weather.
A curious sort.