Rent a glass igloo in Finland to sleep under the northern lights.
Shell Grotto at Margate (UK) - In 1835 Mr James Newlove lowered his young son Joshua into a hole in the ground that had appeared during the digging of a duck pond. Joshua emerged describing tunnels covered with shells. He had discovered the Shell Grotto; 70ft of winding underground passages leading to an oblong chamber, its walls decorated with strange symbols mosaiced in 4.6 million shells. The origins of this grotto are a mystery.