1) Inclined tower 
The Martinitoren (mɑrtinitʊːrən; Martini or St. Martin`s Tower) is the highest church steeple in the city of Groningen, Netherlands and the bell tower of the Martinikerk. The tower is located at the north-eastern corner of the Grote Markt (Main Market Square). It contains a brick spiral staircase consisting of 260 steps, and the carillon with....