There are so many amazing places on Earth, both man-made and natural, but some of them look like they are alien and don’t actually exist. For example, the “Door to Hell” in Turkmenistan that is 69 meters (226 ft) wide, or a casting pool in San Francisco that reminds us more of a secret extraterrestrial garden. When you look at them, you can’t believe you are actually still on our planet.

Bright Side decided to show some more treasures from our world that look amazing and alien at the same time.

1. A casting pool in San Franсisco

2. Kraken art installation in an abandoned building in Philadelphia

© Cpianti / reddit

3. The Door to Hell, a burning natural gas field in Derweze, Turkmenistan

© Tormod Sandtorv / wikimedia

4. Marble Caves, Chile

5. Mosaic Steps on 16th Avenue in San Francisco

6. Giant’s Causeway, Ireland

7. The Kelpies: 30-meter-high horse-head sculptures standing near the Carron River in Scotland

8. Rio Tinto, Spain

9. The Crooked Forest, Poland

10. Manpupuner rock formations, Ural Mountains, Russia

11. Limestone pavement in the Yorkshire Dales National Park, England

12. The Waitomo Glowworm Caves, New Zealand

13. Spotted Lake, Canada

14. Amazon basin from the top between Belem and Manaus, Amazonas, Brazil

15. South East Essex College, Essex, England

16. Devils Tower, Wyoming

© Colin.faulkingham / wikimedia

17. Old abandoned pier for tankers and supply boats, overgrown with coral, Southern Leyte, Philippines

18. Chocolate Hills, Philippines

19. Abraham Lake, Canada

20. Rainbow mountains Zhangye Danxia Landform in Gansu Province, China

Have you ever seen these places with your own eyes? Write a comment below if you want to visit them.