Boynton Canyon in Sedona, Arizona

Boynton Canyon, Arizona, USA, by Scott McAllister. Believe it or not, there are some sensational things to see in Arizona not called the Grand Canyon.

Abismo Anhumas - A cave in Bonito, Mato Grosso do Sul (in Brazil). This cave is equipped with a scuba diving platform and sunlight reaches down to the bottom during certain parts of the day. Click for awesome panoramic pictures.

Where the sun reaches the bottom of the ocean

Anhumas Abyss, where the sun rays touch the ocean bottom.Anhumas Abyss is a cave from the city of Bonito Mato Grosso do Sul, Brazil

Mammoth Cave, United States-The longest cave in World

Mammoth Cave, United States-Mammoth Cave National Park preserves the cave system and a part of the Green River valley and hilly country of south central Kentucky. This is the world's longest known cave system, with more than 400 miles explored.

Scuba diving at the Turquoise Cave in Melissani Lake, Greece

Scuba diving at the Turquoise Cave in Melissani Lake, Kefalonia island - Greece

Hidden Treasure, WA // Ken Duncan. the rock frames the waterfall into a heart shape. a natural beauty.

by Ken Duncan photography - Known locally as ‘The Spa’, this delightful chamber in Western Australia´s Hamersley Gorge beckons the visitor Spring-fed, it is wonderfully cool, a refuge from the burning heat of the surrounding Pilbara.

Mendenhall Glacier Caves, Alaska

29 Surreal Places In America You Need To Visit Before You Die

29 Surreal Place in America You Need to Visit Before You Die - Mendenhall Glacier Caves, Alaska

Blue Grotto, Capri, Italy is unbelievably beautiful!

11 Best Shots of Natural Art

Blue Grotto, Capri, Italy is unbelievably beautiful! Take me to a grotto where I can embrace my inner mermaid.

Smoo Cave, Durness

25 Places In Scotland That Are Straight Out Of A Fantasy Novel

The ancient cave monastery of Vardzia in southern Georgia by Terri84, via Flickr

The ancient cave monastery of Vardzia in southern Georgia. The main period of construction was the second half of the twelfth century. The caves stretch along the cliff for some five hundred metres and in up to nineteen tiers. The Church of the Dormition,

Moonstone Beach

From the cave looking out - At Moonstone Beach on the Humboldt County California coast (Photo by Amanda Coggins)

Subterranean River National Park, Puerto Princesa's Pride.

Puerto Princesa Subterranean River National Park is chosen as one of the New Seven Wonders of Nature. It is found in Puerto Princesa, Palawan, Philippines.

hidden caves in san diego

Secret Sea Cave, Cabrillo National Monument

San Diego County secret sea caves located at Cabrillo National Monument

Glowworm Caves, New Zealand

Waitomo Glowworm Caves Twinkling lights or glowworms hanging from the cave ceiling? If you guessed glowworms, you're right!