Top the tower stands on the edge of Aarau and is considered to be its main attraction. It reaches a height of 62 meters and consists of 10 floors, the lower two of which are underground and have been built much later, after 1820 the city was filled moat.

When exactly was it built, still never managed to figure out, but it is assumed that this occurred simultaneously with the appearance of the city in the middle of the XIII century. The original height of the tower was much smaller than modern sizes, according to historians in the period of XV-XVI centuries it was built, later on it appeared pewter wreath. In 1531 on the tower clock was installed and we can say with 1580 structure did not change its appearance, except that in 1753 tower the bell tower was covered with copper plates.

Directly at the tower are the city gates, the first written mention of which relates to 1359. They have remained practically unchanged since its construction, only in 1928, the city authorities was the decision to expand the passage to through it could pass motorized transport.

Externally, the tower is composed of two parts – a wider bottom and narrow top. The lower five floors of the tower were in the old days jail, located in the ninth clock mechanism. In the tenth until 1876 was the apartment tower of the watchman and the attic is arranged in the bell tower from 11 bells. Directly under the ceiling hung two bells cast in XIV-XV centuries. I can add description