One of the most impressive geological features in the northern park, 600ft-deep Ubehebe Crater is believed to have formed some 2100 years ago in a single eruptive event by the meeting of fiery magma and cool groundwater. Its Martian beauty is easily appreciated from the parking lot, but for closer inspection embark on the 1.5-mile trek along the rim (not recommended if you're vertigo-prone).
For a longer walk, add the detour to Little Hebe crater.
