If you want to go on a trip under the sea or get lost in the depths of the ocean, then head to the aquarium in Florya. There are a total of 15,000 terrestrial and marine species at the Istanbul Aquarium. You can see these species including alligators, piranhas, sharks and poison frogs every day of the week from 10 a.m. – 8 p.m.. The entry fee is 35 TL for adults and 25 TL for students, on weekdays and weekends.