Cave home (Festus/ Missouri)

This is the home of The Sleeper family who built their home in a cave that dates back to a 1930s sandstone mine underneath a forest.
The three-bedroom home is constructed from glass doors and used materials from a local store. Insulation sealant keeps the inside of the home at a cool 65 to 70 degrees year round.
The inside features vast open spaces with the living and dining areas on the ground floor and the bedrooms on the mezzanine above the kitchen. A spring that runs underground of the forest but above the home puts water into a pond filled with goldfish. To prevent sand from falling into their food, they've constructed a ceiling over the kitchen and put an umbrella over the living, eating, and sleeping areas.

10-storey slide in City Museum (St. Louis/ Missouri)

St. Louis City Museum consists largely of repurposed architectural and industrial objects.
One of the most popular attractions are the Enchanted Caves and Shoe Shafts that run through the center of the Museum, all the way to the 10th floor.
In the Enchanted Caves, guests will find an elaborate cave system hand-sculpted by Bob Cassilly and his crew. From every direction, a different creature is staring back.

The Shoe Shafts were left over from when the building was the International Shoe distribution building. To get the shoes from floor to floor, staff would place the shoes on the spiral shafts that would lead down to the loading dock. When the caves originally opened up in 2003, there was only one spiral shoe slide that was three stories tall, but in 2008 a second one was opened, that starts at the roof and goes down to the caves' entrance.

Kansas City Library (Kansas City/ Missouri)