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The Bridge of Sighs is an enclosed limestone bridge in Venice, Italy, built in 1600 to connect the New Prison to the Doge's Palace interrogation rooms.
The Bridge of Sighs in Venice is an enclosed limestone bridge built in 1600, historically connecting the Doge's Palace interrogation rooms to a prison.
Cenote X'Keken (Dzitnup), near Valladolid, Yucatán, Mexico, is a cave cenote celebrated for a shaft of sunlight entering through an opening in its stalactite-hung ceiling.
Cenote Samula, near Valladolid, Yucatán, Mexico, is a cave cenote known for long tree roots descending from the surface through the limestone ceiling down into the water.
A pedestrian and cycle bridge over the Bow River in Calgary, Canada, designed by Santiago Calatrava and opened in 2012, notable for its enclosed helical steel tube structure.
