Bernard Spragg:
PAPAROA NATIONAL PARK. Punakaiki .
spelio:
B1R4-41 Macro of Aragonite Crystals in the roof with finger nail
rwgabbro1:
From Persimmon Gap to Boquillas Canyon, Part 13: Oh, What a Beautiful Faulting; Big Bend National Park, Texas, USA
rwgabbro1:
Architectural Geology of Dougga, Tunisia, Part 5: Another View of the Mausoleum of Ateban (2nd century BC) and the Diapir Zone
spelio:
B3R58-102 Pompey's Pillar from Moralana Creek framed
rwgabbro1:
From Persimmon Gap to Boquillas Canyon, Part 12: Chiaroscuro Canyon, Big Bend National Park, Texas, USA
spelio:
Amazing eroded rocks
rwgabbro1:
In and About Tuff Canyon, Part 9: Learning to Live with Ambiguity, Big Bend National Park, Texas, USA
rwgabbro1:
From Persimmon Gap to Boquillas Canyon, Part 11: Approaching the Mouth of Boquillas Canyon, Big Bend National Park, Texas, USA
Perkins-Boyer Photos:
Cat Ba Archipelago
Perkins-Boyer Photos:
Cat Ba Archipelago
Kira Pichano:
Ancient megalith rock
rwgabbro1:
The Brownstone Chronicles, Part 22: Detail of Old City Hall, Marquette, Upper Peninsula of Michigan, USA (1894)
rwgabbro1:
Architectural Geology of Segovia, Spain, Part 23: San Juan de los Caballeros Church (late 11th Century AD)
Schnauzerfreund:
Feuersteinklippe
Schnauzerfreund:
Höhle an der Teufelsmauer (Timmenrode,Harz)
Schnauzerfreund:
Höhle an der Teufelsmauer (Timmenrode,Harz)
Schnauzerfreund:
Teufelsmauer (Harz)
Schnauzerfreund:
Teufelsmauer (Harz)
rwgabbro1:
A Marvel of Masonry, Part 6: The Palace of the Porphyrogenitus (late 13th Century) and the Blachernae Walls (different sections in different centuries), Istanbul, Turkey
Denis Trente-Huittessan:
Château de de Montrottier - Lovagny (Haute-Savoie, France)