1. The Door to Hell (Turkmenistan)

The Darvaza gas crater, also known as the Door to Hell or the Gates of Hell, is a unique place in the world. While digging for gas, the ground collapsed in a sinkhole and started leaking methane gas. Wanting to contain it, Soviet geologists set the gas on fire to prevent it from spreading. It has been burning continuously since 1971. In January 2022, President Berdymukhamedov publicly declared that a method to extinguish the fire needs to be found so that the effects on the environment and public health can be curbed.

2. Grand Prismatic Spring (USA)

This spring is the largest hot spring in the United States and the third largest in the world. It is located in Yellowstone National Park, Wyoming. It was first discovered by geologists in 1871, who gave it its name because of the coloration of the spring. The colors are those of a rainbow, which you can also get by shining white light through a prism.

3. Nasir al-Mulk Mosque (Iran)

This mosque in Iran, which is also known as the Pink Mosque, is famous for its extensive colored decorational glass. Light is an important part of many mosques, because it is a major symbol for God in Islam. The stained glass windows of the mosque create a tapestry of beautiful colors on the floor of the prayer hall.