3. Villa Pisani labyrinth, Stra, Italy
Deemed the most difficult labyrinth in the world to solve, Villa Pisani even had Napoleon mystified and lost.
Steeped in heritage, the labyrinth was created in 1720 and is located outside Venice's city limits in Stra. With towering hedges forming nine concentric rings, they'll be no peeking over the tops of these hedges.
If you ever reach the centre, you'll find yourself at a small tower with a spiral staircase and turret, to survey everyone still finding their way.