Huntington Falls at Stow Lake, Golden Gate Park, San Francisco, California. An artificial falls built on an artificial hill (Strawberry Hill) flowing into an artificial lake in Golden Gate Park. Turn of the century urban park design.
Ice cave in the Skaftafell National Park in Iceland. Ice caves collapse and new ones form as each glacier grinds slowly towards the sea. Local guides can help you (without dying) find one. (Visit Skaftafell National Park in Iceland.