| 21. | The moss gets encrusted with travertine and fresh moss grows further out.
|
| 22. | The fountain was executed in travertine in 1642 & ndash; 43.
|
| 23. | The interior walls are American Travertine from Mankato, Minnesota.
|
| 24. | These accumulated travertine landscapes and pools are Huanglong's main attraction.
|
| 25. | A large maple tree protects the raised travertine marble terrace.
|
| 26. | Tufa is similar to travertine but is even softer and more porous.
|
| 27. | Travertine is salt tolerant and has a low sunlight reflection.
|
| 28. | Its outer facing today is made of bricks and travertine.
|
| 29. | The local travertine was extensively used as a building material.
|
| 30. | A fa�ade, in travertine, remained to be constructed.
|
