Game of Thrones
Dragon Crypt in Meereen
Daenerys locks two of her dragons in the dungeon underneath Meereen in episode 4x10 “The Children”. Daenerys returns to visit her dragons in episode 5x01 “The Wars to Come”. Dany takes the leaders of the old families down here to scare them in episode 5x04 “Sons of the Harpy”.
Source: Winter Is Coming
Tunnels under Meereen
Grey Worm leads some Unsullied into Meereen through the sewers and begins a slave uprising in episode 4x04 “Oathkeeper”.
Source: Splitski Portal
Meereen Alleys
The Sons of the Harpy attack people in a back alley in order to draw the Unsullied into a trap in episode 5x04 “Sons of the Harpy”.
Source: Winter Is Coming
Meereen Street
A group of Unsullied hear a disturbance and run towards it and later Barristan Selmy does the same in episode 5x04 “Sons of the Harpy”.
Meereen Square
A group of Unsullied rush through a small square on their way to the disturbance in episode 5x04 “Sons of the Harpy”.
Meereen Corridor
A group of Unsullied are ambushed by the Sons of the Harpy before Barristan Selmy comes to the rescue in episode 5x04 “Sons of the Harpy”.
Source: Wikipedia