A Collection of Guesses...

I've been thoroughly entertained at the speculation of WTF is going on in our backyard. The current list of guesses so far is below, along w/ the number of times it was guessed. If there's no number, it was only guessed once; if there is a number, that number is inclusive of the first person who guessed it. Some are rather detailed answers and very close to other guesses, but due to the creativity, I decided not to combine some of them. Also, what is wrong with some of you???
Abstract Art
Aeolian Harp
Airbnb for Squirrels
Archery Range
Bandstand
Bomb Shelter
Brick & Turf Helicopter/Helicopter (2)
Catapult
Clock (2)
Crop Circle - Sorry for the initial omission, Jason!
Curved Bench w/ Arbor
Dining Terrace
Firepit (9)
Flower Bed (2)
Fountain Base for Peeing Cherub
Franzywood
Gazebo (3)
Giant Musical Instrument
Grain Silo
Ground-Level Weather Vane
Half-Circle Planter
Herb Garden
Home Crematorium
Horse Bath
Horse Jump
Horse Walker
Horseshoe Pit
Jacuzzi
Koi Pond (2)
Kubb Game
Landing Pad for Aerowolf
Manure Compost Area
Miniature Coliseum
Miniature Coliseum to Cast Heathen Critters to the Lions (or Squirrels)
Miniature Hollywood Bowl
Miniature Stonehenge/Stonehenge 2.0 (3)
Mini Racetrack for Ernest (3)
Outdoor Oven (5)
Pile of Bricks
Playground for Ernest (2)
Pond
Primitive Super Collider
Rabbit Cirque du Soleil
Raised Garden Bed
Retaining Wall
She Shed
Shed
Shotput/Discus Throw Pad (2)
Slingshot
Squirrel Launch
Squirrel Teeter-Totter w/ a Classic Roman Coliseum
Stations of the Cross
Stone Igloo
Sundial (9)
Swimming Pool (3)
Trebuchet
Turtle Habitat (2)
Walking Meditation Labyrinth
Water Garden
Well
Wishing Well
Zen Garden
Zombie Fence
So What is it?
Well, I'm not going to tell you yet. But I will say there are some REALLY close guesses... And it isn't exactly a SINGLE thing. So there's your hint.
A few thoughts:
My British friend participated in the banter, so if you are an American rube like me, I included the link to what a Folly is in case you didn't know. You can also sense the British influence c/o #32.
I will one day have a Franzywood. No I won't. But that would be cool. Kinda. Instead of roller coasters like Dolly, we'd have crochet classes and naps.
A Koi Pond would be quite handy for the goldfish we are returning to the pet store today. Because HE'S HUGE. We got him as a snack for Ernest, but instead he eats Ernest's crickets. So he's history. But I'm sure he would have appreciated a Koi Pond.
I'm fascinated that two people guessed a shotput/discus throw pad.
I also feel that the number of times a "coliseum" of sorts came up is high. I suppose I should consider what that says about us.
It's still not a sundial, Brandon.
Trebuchet. I didn't combine this w/ #8, because I think Megan deserves props for calling out a specific type.
If all goes well, it won't be long before the project becomes obvious. Hope you stick around to see what it is.