A surreal-looking boulder formation called The Crawl can be found in Spring Bay.

The sandstone forming the bluffs has a tendency to fracture into blocks, creating unusual boulder formations.

There is no plausible explanation yet for the presence of these unusual wind-carved boulder formations on a flat sandy island.

Someone had used one of the larger boulder formations for the back wall and had built a rough lean-to out of branches and canvas.

Just outside Denver, filmgoers trade seascape views for the huge rock and boulder formations of the Red Rocks Amphitheater.

Most day visitors come to see the Baths, a bay with huge boulder formations jutting from the water and private swimming in sea caves.

The fitness center, with tall windows overlooking boulder formations, is in the spa's west wing.

The Keldara had managed to create a sort of bunker using a boulder formation that was already in a tripod.

Green Rock between just one and 28 meters deep are boulder formations with an array of short tunnels and swim throws.

The reach at the confluence of Brush Creek is particularly notable for the large boulder formation, known as "Flat Rocks".

A surreal-looking boulder formation called The Crawl can be found in Spring Bay.

The sandstone forming the bluffs has a tendency to fracture into blocks, creating unusual boulder formations.

There is no plausible explanation yet for the presence of these unusual wind-carved boulder formations on a flat sandy island.

Someone had used one of the larger boulder formations for the back wall and had built a rough lean-to out of branches and canvas.

Just outside Denver, filmgoers trade seascape views for the huge rock and boulder formations of the Red Rocks Amphitheater.

Most day visitors come to see the Baths, a bay with huge boulder formations jutting from the water and private swimming in sea caves.

The fitness center, with tall windows overlooking boulder formations, is in the spa's west wing.

The Keldara had managed to create a sort of bunker using a boulder formation that was already in a tripod.

Green Rock between just one and 28 meters deep are boulder formations with an array of short tunnels and swim throws.

The reach at the confluence of Brush Creek is particularly notable for the large boulder formation, known as "Flat Rocks".