The gigantic Yellowstone Grand Canyon, lined with volcanic rock. With all the effects of hydrothermal activity, river erosion ...

Columnar cliffs form when lava from a volcanic eruption cools and contracts ... allowing for a close-up side view of the rock columns. Looking up at Tōjinbō from the water is also recommended.

The steep cliffs and high rocks of a volcanic mountain made it difficult for enemies to attack and helped the defenders inside look out for attackers. Research castles to find out what other ...