Starting at minster square, you will learn interesting background information about the construction of Ulm Minster with the highest church tower in the world (exterior tour). The tour then takes you to the neighbourhood north of Ulm Minster and on to the new Ulm city centre. Under the motto ›Medieval meets modern‹, you will see several new buildings that have been constructed in the heart of Ulm in recent years and decades. These buildings are a tribute to the unique modern architecture and form a charming contrast to the historical sights. The Ulm Town Hall awaits you in the immediate neighbourhood. The early Renaissance building not only displays what is probably Germany's largest fresco cycle of the 16th century, but also an astronomical clock with zodiac signs and moon phases. The tour continues past the leaning Butcher tower and onto the city wall. Things get really romantic in the fishermen's and tanners' quarter. With its small alleyways, bridges and footbridges, Ulm's most important old town ensemble conveys a medieval flair. Today, the once shabby craftsmen's quarter awaits you with top-restored buildings – including the Crooked House, the world's most leaning hotel according to the Guinness Book of World Records.