The baroque "Chapel of Merchants, Shopkeepers and Bankers" was built at the end of the 1600s. This lesser known architectural jewel still holds numerous original artworks. The most noteworthy of them is the Perpetual Calendar built by the engineering Giovanni Plana — a primitive computing machine that allows its user to look up details about any date between the years 1 and 4000. Powered by a small wooden crank, the intricate gears and chains put into motion the nine inscribed cylinders, The chapel is only open to the public on the weekends, when mass is held. If you are lucky, you can attend the occasional classical music concert and experience the building's impressive acoustics.

Toronto's central square has been compared to New York's Times Square for its abundance of colorful billboards and shining lights. Located in the very midst of downtown, it is a sight to behold both day and night. The square teems with people and enticing shops and dining venues.

Cologne’s main opera house stages a mix of classic and contemporary productions, from Mozart to modern composers. The resident company is strong, and visiting performers keep the programme varied. The building itself is modern and a bit divisive—some love it, some don’t—but the acoustics are excellent.