Hidden deep in a valley in New York's Catskill Mountains, this abandoned circus-themed house is the stuff of nightmares. We can just imagine Pennywise, the terrifying clown from It, roaming its haunting halls. Intrepid urban explorer and photographer Bryan Sansivero has captured the mansion, its outbuildings and grounds in all their eerie glory. Are you brave enough to take a tour?

Tipped off about the property by a fellow explorer, Sansivero wisely chose a sunny day to pay a visit – this is one locale you really wouldn't want to visit after dark. Approaching the main house, the grounds are noticeably neglected, reclaimed by Mother Nature over the years. The unkempt drive and overgrown lawns only add to the sense of foreboding.

Abandoned in recent years, the palatial Jacobean Revival mansion was built in 1925. The family who lived here, an extended Italian-American clan with a penchant for theatrical colour, left the property vacant for reasons unknown. Several attempts have been made over the past decade to sell the house and outbuildings, but the dwelling was mysteriously delisted in 2018.

Upon entering the main house, the disconcertingly bright canary-yellow hallway offers a dramatic first impression. The wallpaper and paintwork are peeling away but the original features, including the hardwood floor and elegant wrought iron banister, are more or less intact and simply require a deep clean and a good polish.

This eerie open door leads to the cellar, but we're not sure we'd have the courage to venture down. What lies below in the bowels of the house is anyone's guess. Note the once-gilded sconce on the wall, which would have lit the way as historic residents descended into the home's spooky underbelly.

The parlour is decorated in the same Day-Glo canary yellow as the entrance hall. While the carved fireplace surround is grand, the room's worn floorboards are loose and buckling, which could indicate a serious damp problem. Or perhaps it's the sinister work of an entity residing in the dark cellar below... we'll leave that to your imagination.

An ornate cast-iron grate graces the hearth, which looks like it has been well-used over the years. Radiators are few and far between on the ground floor of the property, so open fires would have been a must during the bitterly cold winters that affect this location in the wilds of upstate New York.

While bathed in sunlight, this dilapidated salmon-pink space has a pretty menacing vibe. No doubt adding to the property's seemingly bad luck, a colourful umbrella lies open amongst plaster debris on the dusty floor – a no-no for the superstitious.

Heading upstairs, scraps of yellow wallpaper cling to the wall of the stairwell. A number of recessed alcoves, once home to ornamental vases perhaps, sit alongside red crosses, presumably marked by a decorator working on a revamp that never happened. But of course, the mysterious symbols could serve a much more sinister purpose...

The home's curious circus theme comes to life in the bedrooms upstairs. Peering into the rooms from the landing, we're taken aback by the vivid kaleidoscope of primary colours. Whoever spruced up these spaces was obviously not a fan of muted understated hues!

Talk about a daring colour combo! This child's bedroom or playroom has the look and feel of a big top with its vibrant décor and yellow and purple harlequin border. Several croquet mallets have been left on a stand, with a number of balls strewn across the floor as if by a poltergeist or phantom clown.

Looking up at the ceiling, the big top tent design, which was skillfully created way back when in dramatic yellow and red, is in a very poor state of disrepair. The last remnants of colour are clinging on, while the underlying wallpaper is peeling away to expose the bare wall behind.

The adjacent bedroom hasn't fared too well over the years either. One of the only rooms in the mansion to boast a radiator, the space is no shrinking violet, featuring an especially loud colour scheme that pairs tonal oranges and moss-green with a surprising sky-blue ceiling.

What looks to have once been the master bedroom is decked out in a slightly more sedate powder blue, with a deeper, royal blue border. Once a grand fixture, the fireplace is the space's main focal point, featuring Regency-style detailing with colour-matched blue accents. Looking up at that crumbling ceiling, we don't think anyone's spent a night here in a quite a while...

A French door in the master bedroom leads out onto a spacious terrace. The roof covering that protects the interiors from the elements remains intact and the brickwork looks in decent condition, major bonuses for any potential buyers who wish to renovate the abandoned mansion.

Like the other spaces in the house, this small bathroom is an eerie tribute to the circus. Bold red and white striped wallpaper alludes once more to the iconic big top tent, though its tattered condition makes for a pretty spooky atmosphere. Fortunately, the washbasin is still in place and appears undamaged.

Leading up to the mansion's top floor, the second staircase features a curious rope handrail. Croquet balls are scattered on the steps as if to trip up any trespasser who dares to climb them. The work of a resident ghoul perhaps?

At the top of the house is this vast yellow bedroom, featuring the same worn carpet as the staircase. The striped curtains carry through the circus theme, while the crumbling ceiling feels more like the stuff of renovation nightmares.

Bizarrely, the closet features a painting of a bullfighter by Spanish artist Antonio Casero Sanz, who died in 1973. Whether the picture is an original or a print is difficult to deduce, however, similar works by the painter depicting matadors in the bullring are listed for around £395 ($500) online at auction site Invaluable.

Strewn on a windowsill lie an array of named keys for the property's numerous outbuildings which are spread out across the acreage. We wonder what caused the family to abandon the estate so suddenly and if the owners might come back one day to reclaim the land?

As well as the main house, there are at least five other buildings on the large plot in various states of disrepair. Two or three are residential, while others served as booming commercial businesses back in the property's heyday. Let's see what secrets lie inside...

First up is this scary-looking cottage, which in spite of its overgrown appearance, shouldn't be overly challenging to fully renovate. Perhaps a later addition to the estate built by the property's former owners, the two-storey structure is crafted from stone and wood, giving it a rustic feel.

Venturing into what looks like the cottage's grand living room or library, we can't help but be impressed by the fresco of a fantastical landscape that covers the entire wall surrounding the doorway. Sadly, it appears to have been warped by damp, though in the hands of an expert renovator, perhaps this artistic masterpiece could be restored to its former glory.

A blackened fireplace takes pride of place in the room, which impresses with its solid oak panelling and grand built-in cupboards, that would not look out of place in a millionaire's house. Curiously, an antique wooden backgammon set sits on the floor as if waiting for a game to begin. As with the main house, there seems to be some unfinished business here.

After leaving the cottage, overgrown vines offer a clue as to what some of the property's outbuildings were previously used for. The estate is situated in a region of the US that is famous for its wineries. The first vineyard in America was located in upstate New York, and the state is home to the country's oldest continuously operating winery.

Indeed, the barn on the property was used to process and store wine. A tapped cask is shown atop a dusty trunk, while several bulbous demijohns or carboys, as they are also known, litter the space. One of them even still contains wine, which has presumably been left to age for quite some time.

A small stack of labels left in the barn provides a clue as to what the estate was producing. On closer inspection, the printed labels feature a red stag and the name 'Deerhaunt Wine'. No records exist of the winery, so it's likely the operation was a very small-scale family concern. As well as the labels and empty bottles, some pipettes and an old American flag can also be glimpsed.

In the grounds surrounding the barn, a spooky sight awaits in the woods. A child's treehouse, complete with slide, leans jauntily beneath a tree canopy. Decked out with glass windows, a domed roof and spindled balustrades, this thoughtfully designed playhouse now looks less than stable.

Adding to the eerie atmosphere, a couple of swings that are attached to the playhouse's frame sway ominously in the breeze. It's hard not to feel that ghosts from the sprawling estate's heyday still linger here...

This eerie, enigmatic property keeps its secrets close to its chest, and with so many unanswered questions, we'll never know why the previous owners abandoned its haunting circus-themed halls. A shadow of its former self, this once-playful property has gone from the stuff of childlike dreams to a derelict nightmare.

Loved this? Step inside the abandoned mansion untouched for 40 years