One of the last free public hot springs is decorated with hippie art.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Four hundred granite steps were built into this massive rock by the National Park Service.

Quite simply the largest tree in the world (by volume).

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Towering basalt columns, a creation of fire and ice.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A popular tourist cave with a dark past.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

A psychedelic labyrinth on the San Francisco bay.