Question: How high over the Las Vegas strip was the roller coaster in the building formerly known as Vegas World?

full_context: Document 1: New York-New York Hotel and Casino: New York-New York Hotel & Casino is a hotel and casino located on the Las Vegas Strip at 3790 Las Vegas Boulevard South, in Paradise, Nevada. It is owned and operated by MGM Resorts International.
Document 2: Kingda Ka: Kingda Ka is a steel accelerator roller coaster located at Six Flags Great Adventure in Jackson, New Jersey, United States. It is the world's tallest roller coaster, the world's second fastest roller coaster, and was the second strata coaster ever built. It was built by Stakotra, a subcontractor to Intamin. Riders have to be 54" in order to be able to get on the roller coaster.
Document 3: Magnum XL-200: Magnum XL-200, colloquially known as simply Magnum, is a steel roller coaster built by Arrow Dynamics at Cedar Point in Sandusky, Ohio. When built in 1989, it was the tallest, fastest, and steepest complete-circuit roller coaster in the world as well as the first hypercoaster – a roller coaster that exceeds 200 ft in height. Some have credited Magnum with starting a period in the industry known as the "roller coaster wars", in which amusement parks competed with one another at a rapid pace to build the next tallest and fastest roller coaster. More than 40 million people had ridden Magnum as of 2009.
Document 4: Superman – Ride of Steel: Superman – Ride of Steel is a steel roller coaster located at Six Flags America amusement park near Upper Marlboro, Maryland. Ride of Steel is an identical model located at Darien Lake amusement park in Darien, New York. Both are hypercoasters reaching heights above 200 ft , and were manufactured by Intamin. The installation at Darien Lake opened to the public on May 15, 1999, and the replica at Six Flags America opened a year later on May 13, 2000. Six Flags New England's Superman the Ride roller coaster was previously known as "Superman – Ride of Steel" prior to 2009, but it features a significantly different layout.
Document 5: High Roller (Stratosphere): The High Roller (also known as the Let it Ride High Roller), was a steel roller coaster constructed on top of a building 909 ft over the Las Vegas Strip. It was the highest roller coaster in the world when compared to the surrounding terrain. It was located on top of the Stratosphere Tower, Las Vegas, Nevada, which is the tallest free-standing observation tower in the United States. The coaster was manufactured by S&MC GmbH Structures and Machines.
Document 6: Las Vegas Strip: The Las Vegas Strip is a stretch of South Las Vegas Boulevard in Clark County, Nevada, known for its concentration of resort hotels and casinos. The Strip is approximately 4.2 mi in length, located immediately south of the Las Vegas city limits in the unincorporated towns of Paradise and Winchester. However, the Strip is often referred to as being in Las Vegas. Most of the Strip has been designated an All-American Road, and is considered a scenic route at night.
Document 7: Stratosphere Las Vegas: The Stratosphere Las Vegas (formerly Vegas World) is a hotel, casino, and tower located on Las Vegas Boulevard just north of the Las Vegas Strip in Las Vegas, Nevada, United States.
Document 8: Superman: Escape from Krypton: Superman: Escape from Krypton (originally known as Superman: The Escape) is a steel shuttle roller coaster located at Six Flags Magic Mountain in Valencia, California. When it opened in 1997, it was the tallest roller coaster in the world, and its speed of 100 mph was tied for the fastest with Tower of Terror II, a similar roller coaster which opened two months earlier at Dreamworld in Australia. These two coasters were the first to utilize Linear Synchronous Motor (LSM) technology to propel vehicles to top speed. The park originally intended to open the ride in 1996, but the opening was delayed because of several issues with the launch system. The ride was closed in late 2010 for refurbishment, and it emerged in 2011 as "Superman: Escape from Krypton". The refurbished ride featured new trains which face backward, and it was painted with a new color scheme. As of 2013, Superman: Escape from Krypton has the third-tallest structure, the fifth-fastest speed and the third-longest drop in the world.
Document 9: Vegas World: Vegas World was a space-themed casino and hotel on Las Vegas Boulevard in Las Vegas, Nevada. It was owned and operated by Bob Stupak, and was also signed as Bob Stupak's Vegas World.
Document 10: List of tallest buildings in Las Vegas: The city of Las Vegas, Nevada and its surrounding unincorporated communities in the Las Vegas Valley are the sites of more than 160 high-rises, 42 of which stand taller than 400 ft . The tallest structure in the city is the Stratosphere Tower, which rises 1149 ft just north of the Las Vegas Strip. The tower is also the tallest observation tower in the United States. Since the Stratosphere Tower is not fully habitable, however, it is not considered a building. The tallest building in Las Vegas is the Fontainebleau Resort Las Vegas, which rises 735 ft and was topped out in November 2008. This building, however, is currently on hold. The tallest completed building in the city is the 52-story Palazzo, which rises 642 ft and was completed in 2007.
Document 11: Millennium Force: Millennium Force is a steel roller coaster built by Intamin at Cedar Point amusement park in Sandusky, Ohio, United States. It was the fourteenth roller coaster to be built at the park since Blue Streak opened in 1964. Upon completion in 2000, Millennium Force broke six world records and was the world's first Giga Coaster, a roller coaster that exceeds 300 ft in height and completes a full circuit. It was briefly the tallest and fastest in the world until Steel Dragon 2000 opened later the same year. The ride is also the third-longest roller coaster in North America after The Beast at Kings Island and Fury 325 at Carowinds. It was the first roller coaster to use a cable lift system rather than a traditional chain lift. The coaster has a 310 ft , 45-degree lift hill with a 300 ft drop and features two tunnels, three overbanked turns, and four hills. It has a top speed of 93 mph .
Document 12: The Venetian Las Vegas: The Venetian Resort Hotel Casino is a five-diamond luxury hotel and casino resort located on the Las Vegas Strip in Paradise, Nevada, United States, on the site of the old Sands Hotel. Designed by KlingStubbins, the hotel tower contains 36 stories and rises 475 ft . The Venetian is owned and operated by Las Vegas Sands. The Venetian also serves as the seat of the corporate headquarters for its parent company.
Document 13: Sky Las Vegas: Sky Las Vegas is a 45-story luxury high-rise condominium tower with 409 units, situated on a 3-acre site on the Las Vegas Strip in Winchester, Nevada. The tower's land, as well as nearby property, had been the site of the El Rancho Vegas hotel and casino from 1941 to 1960, when it burned down. The property remained vacant for decades. A two-story retail project had been planned for a portion of the site in 2001, although it ultimately did not materialize. Plans for Sky Las Vegas were announced in July 2004, with construction beginning the following year and its opening occurring in May 2007.
Document 14: The Palazzo: The Palazzo is a luxury hotel and casino resort located on the Las Vegas Strip in Paradise, Nevada. It is the tallest completed building in Nevada. Designed by the Dallas based HKS, Inc., the hotel offers luxury in an Italian Renaissance ambiance. The hotel and casino are part of a larger complex (operated as one hotel) comprising the adjoining Venetian Resort and Casino and the Sands Convention Center, all of which are owned and operated by the Las Vegas Sands Corporation.
Document 15: Steel Eel: Steel Eel is a custom roller coaster built by D. H. Morgan Manufacturing. At a height of 150 feet, "Steel Eel" is the tallest roller coaster at SeaWorld San Antonio and was the second coaster built by SeaWorld, following The Great White (1997), after new management felt the park needed to offer more thrilling rides. "Steel Eel" had to be custom built to fit along the slim area beside the lake and utilizes a simple lapbar and seatbelt restraint system. Key elements of "Steel Eel" include two hills after the lift hill with a small valley between the two and a diving dogleg turn and triple humpback hills after its mid-course brake run. With a paint scheme consisting of bright yellow track and teal-green supports, it has become a permanent staple in the park's skyline.
ground_truth: 909 ft