Quantum Foam by Pedro Moura Pinheiro - Nazaré, Leiria, Portugal.
Visit stunning Antelope Canyon
Antelope Canyon, Arizona- After you squeeze into the canyon you're met with a metal ladder to help you get to the bottom. Before the ladder was installed travelers had to rappel to the bottom, and there wouldn't be any way to get out of the canyon at the opposite end without a ladder. Photo by Travis Burke.