Fatheads or Mirror Maze Petrin Park

What started as a planned easy day discovering Petrin Park was foiled by the dreaded "closed" Funicular Railway(until next Friday!) Think of Scenic Railway, but longer(just had a flash memory of Brendan climbing up the Scenic Railway after getting stuck down there after the last train!!....then a memory of abseiling down the Three Sisters after being stuck on the second sister after dark...also with Brendan!!!).
From Ujezd Street tram stop it was up....up.... up, past the closed Funicular station, up...up...to a fantastic view across Hradcany ....up...up...up to where you get off the funicular....up...up along the Hunger Wall (allegedly commissioned by Charles IV in 1360 to give the poor employment during a period of famine, 1200 m of it has survived)...up...up past an observatory to the Mirror Maze (50Kc adults/under 10 free) and the Observatory Tower which is a small version of the Eiffel Tower (60 m high) built in 1891.
Unfortunately by the time we arrived visibility was about 50 meters so we decided not to scale the 299 steps to the viewing platform of the tower. The Mirror maze was great fun, especially the room full of distorted mirrors. M chose his favourite, below, which he has aptly named "fatheads":