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.
Emerald pool at Subway, Zion National Park, Utah. This isn't part of Emerald Pools. It is called "The Subway" Bring your asses out here you two and lets all go for an adventure! This is like an hour from my place here!
Mudhdhoo (Vaadhoo) Island, Maldives, Sea of Stars is created by microscopic bioluminescent phytoplankton that glow in blue when disturbed or agitated, creating a “stellar” display on the beach at night.