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Water from Donut Falls, Utah, seeps through a hole in the cave ceiling. The water freezes through the night and thaws through the day during winter.

Water from Donut Falls, Utah, seeps through a hole in the cave ceiling. The water freezes through the night and thaws through the day during winter.

Montmorency Falls  ( Quebec, Canada )

Living on the edge: 30 extreme photos that will take your breath away

EZRA STOLLER, JFK AIRPORT TWA TERMINAL 1962: one of *the* architecture photographers of the 20th century.

EZRA STOLLER, JFK AIRPORT TWA TERMINAL 1962: one of *the* architecture photographers of the 20th century.

CITGO Sign: Kenmore Square, Boston, MA. Visible from Cambridge - an iconic Boston sign.

CITGO Sign: Kenmore Square, Boston, MA. Visible from Cambridge - an iconic Boston sign.