Like many old European cities, Prague once had city walls and gates. The Powder Tower is one of those gates, and it dates back to the 11th century when it was one of 13 entrances into Prague's Old Town. It was originally called the New Tower, but its name was changed in the 17th century when it was used to store gunpowder. This is the gate future kings of Bohemia used to pass through on their coronation parades along the traditional Royal Way to the Prague Castle.
Today the tower houses a permanent exhibition called Prague Towers. The tower is 213 feet high, and there is a viewing platform at 144 feet, accessible by 186 stairs, where visitors can see the city from above. The Powder Tower and the Old Town Bridge Tower are the only remaining parts of Prague's former old town fortification.