The tower in the image is the Powder Tower (Prašná brána) in Prague, Czech Republic.
It is an iconic Gothic structure dating back to 1475. The tower originally served as
one of thirteen city gates leading to Prague's Old Town. It received its current name
in the 17th century, when it was used to store gunpowder. Today, the 65-meter-high
tower houses an exhibition, and visitors can climb the 186 stone steps to a
viewing platform 44 meters high.