“This is such a familiar story,” Victorian Society president Jones added.
“The tangle of ownership needs to be cut aside by a latter-day perfect gentle knight, so this sleeping beauty, this unique monument, can come back to life.”
The Faenol Estate hosted 40,000 people with millions of others listening to music from the venue when Radio 1’s Big Weekend was held there in 2010.
Five years earlier, hundreds of thousands visited over the week as the site hosted the National Eisteddfod in 2005.
The Faenol Festival, which ran between 2000 and 2009, and was organised by singer Bryn Terfel, also attracted more than 30,000 music fans every year.
While these events have taken the limelight, the Faenol Mausoleum, described as “a cosy and romantic folly” has almost been forgotten, hidden away in woods some way from the main stage.
Now covered in graffiti, it is a significant part of the history of an estate that once consisted of 36,000 acres, stretching from the Llŷn Peninsula to Eryri, or Snowdonia.
Various parts are now owned by different groups and individuals, including the National Trust, external, but it’s unclear who exactly is now responsible for the mausoleum, according to the Victorian Society.