A secret passage - they are awesome.
These 44 Rooms Are Straight Out Of Your Fantasies. What They're Used For Is Even…
~~Pool of Reflections | underground pools of Jenolan Caves, New South Wales, Australia by xeyr~~
Unique indoor swimming pool in a tunnel underneath or next to the house! One of our most pinned images!
Nature Made Underground Pool in Mexico
Underground pool connecting 2 villas.
underground house with pool--I'm not a big "dream mansion" pinner but this is pretty damn cool.
Awesome underground pool.