© Sandra Vallaure
Portuguese Calçada Across the World
Its origin and worldwide expansion

30.01.2017
©Cssantos
Pedras Parideiras (rock delivering stones)
When stones give birth to stones

23.11.2016
©Nelson Cristo
The Great Source of Portuguese Marble
The Estremoz Anticline

23.09.2016
©Luís Lopes
465 Million Years of History
Arouca Trilobites

16.09.2016
©Nelson Cristo
Can an Inactive Stone Quarry be Environmentally Beneficial?
Impact as an environmental catalyst

10.09.2016