One of Hong Kong’s most unusual sights is the stone wall tree—a mature tree growing directly out of a masonry retaining wall.

These remarkable trees first appeared during the colonial era when thousands of stone retaining walls were built to stabilize Hong Kong's steep hillsides. Over time, seeds carried by birds and wind became lodged in cracks between the granite blocks. Dust, decaying leaves, and moisture accumulated in these crevices, creating tiny pockets of soil where the seeds could germinate.

Credit: Wikimedia Commons

Just off Bessemer Mine Road, not far from Pioneertown, in California’s Mojave Desert stands what appears to be an unremarkable ring of shrubs. To a casual observer, it looks like a cluster of ordinary creosote bushes growing in a circle. Yet this humble patch of vegetation is one of the most extraordinary living things on Earth. Known as King Clone, it is estimated to be about 11,700 years old—older than nearly every human civilization that has ever existed. Scientists consider it one of the oldest living organisms on the planet.

King Clone. Credit: Wikimedia Commons