Formations caused by a certain type of lava.

The three trolls of Vik frozen in stone.

Price:
Flight: $500/each (w/ 1 pc luggage) WOW airlines
AirBNB: $136 /night (Split 5 ways ~$28/night)
Rental Car: $600 (Large SUV for 5 people, but a small car would have done fine and cheaper)
Bubble Hotel: $270 / night
Blue Lagoon: $60 / each
Whale Watching: $80 / each
Glacier Hike Tour: $162 / each
Southern Iceland Tour:  $200/each
Golden Circle Tour: $76 / each
River Rafting: $206 / each