In the picture you see a sedan crater than can be visited in Nevada Test site. You can see how enormous it is when you compare it with the space a platform takes in the picture. This crater is a result of an underground test of storax sedan and remains the largest man made crater. The nuclear testing was done in the 60s to look for non military use of nuclear explosives.
The nuclear device buried 635 ft under the ground displaced 11,000,000 tons of soil, leaving a crater 320 ft. deep and with a diameter of 1280 ft. It is the largest depression caused by a nuclear detonation. Over 10,000 people visit the crater every year. The test took place on July 6, 1962 and resulted in large amounts of radioactive fallout. The negative effects and health concerns apart, it remains a sight to behold.