Riding a motorbike through Lautan Pasir (the "Sea of Sand") in the Tengger Caldera.
This very soft sand is actually thin volcanic ash, and there is about 5 Km of it to go through.
For more information about the Bromo Tengger Semeru National Park, read en.wikipedia.org/wiki/Bromo_Tengger_Semeru_National_Park
Photos of the Tengger Caldera (and its Sea of Sand), and of the Bromo Volcano (Java, Indonesia).
For more information about Bromo Volcano, read en.wikipedia.org/wiki/Mount_Bromo.
Photos taken in Indonesia.
Related photos:- Malaysia and Indonesia