paragraph_text: A major part of Southern Nevada's economy is based on tourism, including gambling. The primary drivers of the Las Vegas economy have been the confluence of tourism, gaming, and conventions which in turn feed the retail and dining industries. The city serves as world headquarters for the world's two largest Fortune 500 gaming companies, Harrah's Entertainment and MGM Mirage.

paragraph_text: Big Hatchet Peak is the high point of the Big Hatchet Mountains, a small but rugged range in the southwest corner (the "Bootheel") of New Mexico, in the United States. The mountains are located in southeast Hidalgo County, about southwest of Deming. The range runs roughly northwest-southeast, and is about long; the southeastern edge of the range is within of the border with Mexico. They lie primarily on BLM land.

paragraph_text: O'Donnell Heights is a neighborhood named for a public housing development in the far southeastern part of the city of Baltimore, Maryland, United States. It is located south and east of Interstate 95, just west of the border with Baltimore County, and north of the St. Helena neighborhood.

paragraph_text: Humboldt Township is one of twelve townships in Humboldt County, Iowa, USA. As of the 2000 census, its population was 624. Despite its name, the township does not contain the City of Humboldt.

paragraph_text: The Ruby Range is a subrange of the Valhalla Ranges of the Selkirk Mountains of the Columbia Mountains in southeastern British Columbia, Canada, located west of the northern end of Slocan Lake.

paragraph_text: The Rousseau Range is a small mountain range in southeastern Alaska, United States, located just north of the Peabody Mountains. It has an area of 264 km and is a subrange of the Boundary Ranges which in turn form part of the Coast Mountains. The range is located entirely within Misty Fjords National Monument.

paragraph_text: New York City is situated in the Northeastern United States, in southeastern New York State, approximately halfway between Washington, D.C. and Boston. The location at the mouth of the Hudson River, which feeds into a naturally sheltered harbor and then into the Atlantic Ocean, has helped the city grow in significance as a trading port. Most of New York City is built on the three islands of Long Island, Manhattan, and Staten Island.

paragraph_text: Pieck Range () is a short mountain range surmounted by Zwiesel Mountain, located at the east side of Humboldt Graben in the Petermann Ranges, Wohlthat Mountains in Antarctica.

paragraph_text: The Wild Horse Range is a mountain range in Elko County, Nevada, United States, northwest of the Owyhee River's Wild Horse Reservoir. It is contained within the Mountain City Ranger District of the Humboldt-Toiyabe National Forest. The range is considered to be a sub-range of the Jarbidge Mountains.

paragraph_text: The Sikorsky VS-44 was a large four-engined flying boat built in the United States in the early 1940s by Sikorsky Aircraft. The VS-44 was designed primarily for the transatlantic passenger market, with a capacity of 40+ passengers. Three units were produced: "Excalibur", "Excambian", and "Exeter".

paragraph_text: Lake Humboldt or Humboldt Lake is an endorheic basin lake in northern Churchill County and southern Pershing County in the state of Nevada in the United States. The lake has the name of Alexander von Humboldt, a German natural scientist.

paragraph_text: The Badshot Range is a subrange of the Duncan Ranges of the Selkirk Mountains of the Columbia Mountains in southeastern British Columbia, Canada, located west of Duncan Lake and Westfall River east of Trout Lake.

paragraph_text: The Humboldt Range is a largely north-south running range of mountains in northwest Nevada, USA, that extend from the town of Imlay in the north to the junction with the West Humboldt Range in the south. It is bordered continuously by Interstate 80 and the Humboldt River, largely expanded in the form of the Rye Patch Reservoir in this area, on the west side and by a long and fairly broad Buena Vista Valley to the east, in a typical basin-and-range pattern. The Humboldts are ostensibly visible to travelers along Interstate 80, especially with respect to the highest point of the range, Star Peak, which with a quite nicely defined tip reaches an elevation of 9,836 feet (2,998 m), located in the center of the north range section. The midpoint of the range is in the area of Fourth of July Flat. The Humboldt Range is also noteworthy for having a famous historical town at its base on the eastern side called Unionville, which, for a brief period, was home to Samuel Clemens. Another historical site, now a ghost town, nearby is called Star City. Unlike some ranges in the vicinity, the substantial height of the Humboldts allows for a number of continuously flowing watersheds, and hiking the terrain is a somewhat noted activity.

paragraph_text: Granite Peak is the highest mountain in both the Santa Rosa Range and Humboldt County, in Nevada, United States. It is the eighteenth-most topographically prominent peak in the state. The peak is located within the Santa Rosa Ranger District of the Humboldt-Toiyabe National Forest, about 12 miles north of the small town of Paradise Valley and 23 miles southeast of the small town of McDermitt. It is the highest mountain for over 80 miles in all directions.

paragraph_text: Landau is a large lunar impact crater that is located in the northern hemisphere on the far side of the Moon. It was named after physicist Lev Landau. The crater Wegener is attached to the northeastern rim. Attached to the southeastern rim is Frost.

paragraph_text: Circus Circus Enterprises constructed Excalibur which opened on June 19, 1990, as the largest hotel in the world, with over 4,000 rooms, covering over 70 acres. As of 2016 it is the seventh - largest hotel (by total number of rooms) in Las Vegas, and the eleventh - largest hotel worldwide. MGM Resorts International purchased the property in 2005.

paragraph_text: The Fox Creek Range is a mountain range in Elko County, Nevada, United States. It is mostly contained within the Jarbidge Ranger District of the Humboldt-Toiyabe National Forest. The range is considered to be a sub-range of the Jarbidge Mountains.

paragraph_text: Columbia Point is a high mountain summit of the Crestones in the Sangre de Cristo Range of the Rocky Mountains of North America. The thirteener is located east by south (bearing 102°) of the Town of Crestone in Saguache County, Colorado, United States. The Crestones are a cluster of high summits in the Sangre de Cristo Range, comprising Crestone Peak, Crestone Needle, Kit Carson Peak, Challenger Point, Humboldt Peak, and Columbia Point.

paragraph_text: The Sawtooth Range is a small mountain range in southeastern Alaska, United States, located just southwest of Warm Pass and on the north side of the East Fork of the Skagway River. It has an area of 97 km and is a subrange of the Boundary Ranges which in turn form part of the Coast Mountains.

paragraph_text: The Lincoln Mountains is a mountain range in southeastern Alaska, United States, located on the Alaskan side of the Portland Canal between the Salmon River and the Soule River, near the community of Hyder. It has an area of 235 km and is a subrange of the Boundary Ranges which in turn form part of the Coast Mountains.

Question: When was the Excalibur built in the large city in the southeastern part of the state where Humboldt Range is located?
Answer: 1990