<P> The Shoelace Factory has shoelace machines from the 1890s . Visitors can order custom - made laces . </P> <P> The World Aquarium was an animal exhibition and rehabilitation center . It housed a variety of animals such as sharks, rays, sea turtles, parrots, tortoises, terrapins, otters, snakes, alligators and sloths as well as the expected freshwater and saltwater fish . The World Aquarium had a shark tank with a glass tunnel running through it, big enough to crawl through, but too small to walk . The aquarium also had stingray petting and allowed stingray feeding for a fee at certain times . The World Aquarium portion of the City Museum ceased operations on September 7, 2015 . </P> <P> The 3rd Floor is home to a number of attractions . In one area is Skate Park, which is a collection of skateboard ramps, without the skateboards, in place having rope swings tied in front of the ramps . There are ramps you can run up and pull your self over like the warped wall from the TV show Ninja Warrior, except this wall is only 10 feet tall . There is also the Everyday Circus, a circus school with students from 6 to 80 + . The Everyday Circus performs daily at the museum and does private parties . Just around the corner from the Circus, is Art City where guests can try their hand at a number of different art techniques, as well as Toddler Town; A section dedicated only to those 6 and under . Beatnik Bob's is directly across from the Circus, which features the "World's Largest Underwear", a collection of vintage video / pinball games, and a concessions stand, bar and coffee shop . Right outside Beatnik's is a 1 / 8 scale model of an Alco Train that children who are 48 inches high and under can ride around the tracks . Past Architectural Hall, the Museum's largest rental space, is the Architectural Museum . Located here is the cross from the "Exorcist," a collection of antique door knobs, and the Museum's current exhibit of Elmslie and Sullivan . Off Architectural Hall, the Museum recently started to add a Natural History Section . On display are a number of insects and taxidermy items . Finally, on the 3rd Floor, the entrance to the three story slide that leads back to the first floor . </P> <P> The 3rd Floor is also home to a small number of hauntings . There have been reports of a piano playing on its own and small children being seen near the Alco Train and various other people talking or crying . </P>

How many slides are at the city museum