Hoodoos look a little bit like naturally formed totem poles and can be found mainly within the Colorado Plateau but most famously you can find hundreds of them in Bryce Canyon National Park, Utah, USA.
The hoodoos in Bryce were formed by the coming together of two different weathering processes. The primary process, frost wedging is when frost gets between the gaps in the rock formations during the winter due to melting snow and expands by up to 10% causing cracks.
Secondly the small amount of rain that falls in the area is very acidic and it's this acid-based rain that sculpts the hoodoos into their magnificent, smoothed, tall columns.
Sadly hoodoos have a limited lifespan and Bryce's are no exception with hoodoo erosion levels calculated at 2-4 feet every 100 years.
I visited Bryce in 2002 and I felt it was even more spectacular than the Grand Canyon, somewhere which many people visit without adding the relatively nearby Bryce to their itineraries.