Adventuredome (formerly Grand Slam Canyon) is a 5-acre (2.0 ha) indoor amusement park at Circus Circus in Winchester, Nevada on the Las Vegas Strip. It is owned by Phil Ruffin. It is contained within a large glass dome, and offers various rides and attractions including the Canyon Blaster and El Loco roller coasters, a rock climbing wall, an 18-hole miniature golf course, a video game arcade, and carnival-type games. Because the park is enclosed, it is unaffected by weather, unlike most theme parks, and is open year-round. Every October from 2003 until 2017, the Adventuredome was turned into the Halloween-themed Fright Dome.

The theme park opened as Grand Slam Canyon on August 23, 1993, in the west parking lot of the hotel. It sits on a reinforced 18" thick deck elevated 18 feet (5 m) above ground. The dome itself consists of over 350,000 sq ft (33,000 m²) of pink tinted, insulated glass over a teal green space frame (to minimize structural poles inside). Each pane of glass weighs approximately 300 lb (140 kg). After customer feedback, the park was closed for 45 days in 1994 to add new attractions. Grand Slam Canyon was renamed the Adventuredome in 1997.

Circus Circus Enterprises (later Mandalay Resort Group) initially owned the Adventuredome until 2005, when it was sold to MGM Mirage, which later became MGM Resorts International. Ruffin purchased the resort and theme park in 2019.

Circus Circus Enterprises announced the theme park on August 26, 1992, as an addition to its Circus Circus Las Vegas resort.^[1][2] The Grand Slam Canyon, themed after the Grand Canyon, would be built west of the casino, on a deck located above a parking lot. Veldon Simpson was the architect,^[3] and Arrow Dynamics was hired to design and build several of the rides.^[4] Perini Corporation was hired to construct the dome itself.^[5] The park cost $90 million to build.^[6][7][8]

Construction was underway in September 1992, and the opening was initially scheduled for the following July.^[3] Circus Circus hoped to have the Grand Slam Canyon opened before the upcoming MGM Grand Adventures Theme Park.^[9] The building's dome design was created entirely out of pink tinted glass, with each pane weighing approximately 300 lb (140 kg). The dome itself consists of over 350,000 sq ft (33,000 m²) of pink insulated glass placed over a teal green frame.^[10] The dome has 8,615 panes of glass.^[11]

Grand Slam Canyon eventually opened on August 23, 1993.^[10][12][13] It featured river-rapid rides, two lagoonlike pools, a lazy creek and a re-creation of a pueblo.^[13] It had four attractions: the Canyon Blaster roller coaster, the Twist 'N' Shout water raft, the Rim Runner, and the Hot Shotz Lazer Tag arena, now known as Lazer Blast.^[12][14] The park also featured eight large animatronic dinosaurs spread throughout the park, with visitors being able to read the informational placards in front of each one. Though visitors could not ride them, the dinosaurs often "interacted" with the visitors, with some spitting water on guests.^[13]

Grand Slam Canyon was initially popular, but visitors often expressed their desire for more things to do. Tom Nolan, the vice president of theme park operations at Adventuredome, suggested that "it was a [matter] of what people wanted versus what they could do" and added that "there were a lot of animatronics, a lot of theming, but people said there weren't enough things to do."^[12] Following the feedback, the park was closed for 45 days beginning in April 1994 to remodel,^[12][15] adding $15 million in new attractions. The park originally charged a $10 admission fee, but this was dropped in favor of a $2.50 fee for each ride.^[16]

During the remodeling, several family-friendly attractions were added, such as Midway shows, Canyon Cars (bumper cars), Sand Pirates (a swinging pirate ship), Miner Mike (a mini roller coaster), Thunderbirds (a mini airplane ride), and Drifters (a mini Ferris wheel).^[15] The Twist 'N' Shout water raft ride was removed to make way for several of these rides, solely due to its size.^[13][15] After the remodeling, as space became available, rides were added to the theme park one or two at a time every few years.^[15] Near the laser tag arena, for example, management added a rock climbing wall and a miniature golf course. Though initially hesitant to add the golf course out of concern for the park's glass dome, there has not been a single golf ball incident as of 2009.^[15] The animatronic dinosaurs were eventually removed.^[13]

In its early years, the park was sometimes also known as "Grand Slam Canyon Adventuredome".^[17][18] The name was changed to simply "Adventuredome" in 1997.^[19][20] The theme park is climate-controlled,^[14] and this helped it succeed over its rival, MGM Grand Adventures, which was outdoors and struggled during the hot summer months in Las Vegas.^[20] The Adventuredome also competed against the nearby Wet 'n Wild water park.^[21]

The Adventuredome began offering IMAX film rides in 1998,^[22][23] including one based on the animated series ReBoot.^[24][25] In 1999, management tried to keep up with the latest developments in the industry by consulting visitor surveys. This resulted in the addition of several dynamic thrill rides across the next few years, including the Inverter that same year, Chaos in 2001, and the Sling Shot in 2004.^[15] The new rides were part of an effort to target an older demographic, from ages 13 and up.^[21]

On February 3, 2013, the Rim Runner was permanently closed to make way for a newer roller coaster named "El Loco", which opened on February 18, 2014.^[26][27] The Rim Runner's closure left the Canyon Blaster as the only original ride left from the park's opening.^[28]

Phil Ruffin purchased Circus Circus and the Adventuredome from MGM Resorts International in 2019.^[29] A renovation took place in 2023, adding several new attractions.^[30]

Aside from rides, the Adventuredome also includes midway and arcade games.^[31]

The current and former attractions at the amusement park are provided below.^[52]

• In the 1999 film Baby Geniuses, the Adventuredome makes an appearance as the fictional "Joyworld" theme park. Sly starts the Canyon Blaster ride with two scientists on board and restraints still open. Both fall from the ride.^[11]
• In the season 3 episode "Rollercoaster Thru Criss" from the TV series Criss Angel Mindfreak, a train "goes through" Criss' body while he stands on the track of the Canyon Blaster ride after the corkscrews, and Criss ends up in the front seat.^[87]