Potemkin Stairs - one of the most famous hero-city of Odessa. Originally it was called ladder Richelieu. In many modern guidebooks describe it as a formal entrance into the city from the sea. The total length of ladder 142 meters and a height of meters
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The Vatican Museums ramped spiral staircase by Giuseppe Momo in The stairs are actually two separate helixes, one leading up and the other leading down, that twist together in a double helix formation.
Potemkin Stairs, Ukraine, found via The World Geography - "The Potemkin Stairs is a giant stairway in Odessa, Ukraine. The stairs are considered a formal entrance into the city from the direction of the sea and are the best known symbol of Odessa.