14. Thrichnukagigur Volcano, Iceland
Hnríhnúkagígur is a dormant volcano in the Brennisteinsfjöll volcanic system near Reykjavík, Iceland. It has an area of 3,270 square meters and a depth of 213 meters. Thrihnukagigur Volcano, which makes you forget that it is a volcano with its colorful appearance, caused fear due to the ashes it spewed in 2010, but it last erupted 4,000 years ago.
The vibrant interior of Thrihnukagigur volcano / Anita Isalska Iceland is the only place in the world where you can directly enter the magma chamber of a volcano. Often hardened lava seals volcanoes that are shut down after an eruption, so the depths of Thrihnukagigur are normally an underground world lurking insight.