Floating homes are unique by their very nature—they are, after all, literally floating on the water. Since it takes a special kind of builder or homeowner to go for the floating home, though, they sometimes come with all sorts of special little details. This floating home, built in 2012, has a lot going on, starting with a green roof and ending with a secret entrance to the basement.

Upon approach, it looks like a more standard high-price floating home, with a modern design that adds wooden accents for an extra-nautical look. Right inside, an open living room, dining area, and kitchen are decorated by sweeping views of the lake from floor-to-ceiling windows. Wood trim, built-in shelves, and an exposed-grain accent wall with compass decor add to the maritime theme.

Also on the first floor: an office with an extra-special feature. A bookshelf becomes a secret door, which is the only entrance to a large basement—or future underwater hideout.

The basement level includes a wine cellar and storage. It’s not much to look at now, but it’d make an incredible batcave.

The main floor has a second office or guest bedroom—although with no secret doors. The second floor is a large master suite, complete with a large bedroom, an en-suite bath, and a walk-in closet. The big draw up here, though, is probably the deck, surrounded by the lake and the green roof for a very pretty setting.

This home was listed for $3.4 million, but it went pending in the last few days—and regardless of what happens there, we’re hoping for some updates on that basement.