We spent the night in a youth hostel in the Dartmoor National Park in Cornwall. Eden Project is a reuse of a spent quarry. I'm not sure what they mined here but it was a big terraced hole that's been reclaimed over that last decade.
More an amusement park about plants and ecology than an formal public garden or private house.
The only ride was this Zip Line with elaborate scaffolding as a temporary support for maintenance maybe. The Arched scaffolding was really cool.