Question: When was the Excalibur built in the city which holds the World Series of Poker?

full_context: Document 1: The Linq: The Linq (formerly Flamingo Capri, Imperial Palace and The Quad) is a 2,640 - room hotel, casino and shopping promenade on the Las Vegas Strip in Paradise, Nevada. It is owned and operated by Caesars Entertainment Corporation. As of 2012, the casino is 32,890 sq ft (3,056 m) with 830 slot machines, 55 table games, and a race and sports book.
Document 2: Flamingo Las Vegas: The property includes a 72,299 - square - foot (6,716.8 m) casino along with 3,626 hotel rooms. The 15 - acre (6.1 ha) site's architectural theme is reminiscent of the Art Deco and Streamline Moderne style of Miami and South Beach. Staying true to its theme, the hotel includes a garden courtyard which serves as a wildlife habitat for flamingos. The hotel was the third resort to open on the Strip and remains the oldest resort on the Strip in operation today. The Flamingo has a Las Vegas Monorail station called the Flamingo & Caesars Palace station at the rear of the property. After opening in 1946, it has undergone a number of ownership changes.
Document 3: World Series of Poker: The World Series of Poker (WSOP) is a series of poker tournaments held annually in Las Vegas and, since 2005, sponsored by Caesars Entertainment Corporation (known as Harrah's Entertainment until 2010). It dates its origins to 1970, when Benny Binion invited seven of the best - known poker players to the Horseshoe Casino for a single tournament, with a set start and stop time, and a winner determined by a secret ballot of the seven players.
Document 4: 2018 World Series of Poker: The 2018 World Series of Poker (WSOP) will take place from May 30 - July 17 at the Rio All Suite Hotel and Casino in Las Vegas, Nevada. There will be a record 78 bracelet events. The $10,000 No Limit Hold'em Main Event will begin on July 2 and conclude on July 14. Unlike previous years the Main Event will not be the final event to conclude, with 13 tournaments scheduled after it. The $1,000,000 Big One for One Drop will also be held at the WSOP for the first time since 2014.
Document 5: 2017 World Series of Poker: The 2017 World Series of Poker was the 48th annual World Series of Poker (WSOP). It took place from May 30 - July 17 at the Rio All - Suite Hotel & Casino in Las Vegas, Nevada. There was a record 74 bracelet events including the third edition of the $565 Colossus tournament and the $10,000 No Limit Hold'em Main Event, which began on July 8.
Document 6: World Series of Poker bracelet: In 2007, Corum became the official bracelet manufacturer for the WSOP. Some of the 2007 World Series of Poker champions received both a watch and a bracelet from Corum. Corum designed four variations for the 2007 World Series of Poker Bracelets. The standard version that is presented to 53 winners features 53 diamonds. The Ladies World Champion receives a bracelet that is adorned with four black diamonds, two rubies and 87 blue sapphires. The $50,000 HORSE Champion Bracelet has 91 black diamonds and two rubies. The World Series of Poker Main Event Bracelet has 120 diamonds on 136 grams of 18 carat (75 percent) white gold. The value of the 2007 bracelets have not been released, but the typical price of a Corum watch ranges from $1,500 -- $30,000 +.
Document 7: Luxor Las Vegas: Ground was broken for the Luxor in March 1992 and the resort officially opened at 4 AM on October 13, 1993, to a crowd of 10,000 people. When it opened, the pyramid, which cost $375 million to build, was the tallest building on the strip and contained 2,526 rooms and a 100,000 sq ft (9,300 m) casino. The resort was financed by ``petty cash ''earned from other Circus Circus Enterprises properties and did not include any outside financial investors. The hotel's pyramid is similar in size to the Red Pyramid and Bent Pyramid of Egypt.
Document 8: Excalibur Hotel and Casino: Excalibur Hotel and Casino is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada, in the United States. It is owned and operated by MGM Resorts International.
Document 9: MGM Grand Las Vegas: The MGM Grand Las Vegas (formerly Marina and MGM - Marina) is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada. The MGM Grand is the largest single hotel in the United States with 6,852 rooms. It is also the third - largest hotel complex in the world by number of rooms and second - largest hotel resort complex in the United States behind the combined The Venetian and The Palazzo. When it opened in 1993, the MGM Grand was the largest hotel complex in the world.
Document 10: Park MGM: The Monte Carlo Resort and Casino is a megaresort hotel and casino on the Las Vegas Strip in Paradise, Nevada, United States. The hotel, with a height of 360 ft (110 m), has 32 floors, featuring a 102,000 - square - foot (9,500 m) casino floor with 1,400 slot machines, 60 table games, and 15 poker tables. It is owned and operated by MGM Resorts International. The hotel offers 2,992 guest rooms, including 259 luxury suites. It is being converted from late 2016 to 2018 into the Park MGM, with the upper floors converted into a boutique hotel, NoMad Las Vegas.
Document 11: World Series of Poker: The idea of a World Series of Poker began in 1969 with an event called the Texas Gambling Reunion. It was an invitational event sponsored by Tom Moore of San Antonio, Texas, and held at the Holiday Hotel and Casino in Reno. This inaugural event was won by Crandell Addington. The set of tournaments that the World Series of Poker (WSOP) would evolve into was the brainchild of Las Vegas casino owner and poker player Benny Binion. In 1970, the first WSOP at Binion's Horseshoe took place as a series of cash games that included five - card stud, deuce to seven low - ball draw, razz, seven - card stud, and Texas hold 'em. The format for the Main Event as a freeze - out Texas hold' em game came the next year. The winner in 1970, Johnny Moss, was elected by his peers as the first ``World Champion of Poker ''and received a silver cup as a prize.
Document 12: 2017 World Series of Poker: The Main Event drew 7,221 players, the largest field since 2010. The top 1,084 players finished in the money. Each player at the final table earned $1,000,000, with the winner earning $8,150,000.
Document 13: Excalibur Hotel and Casino: 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.
Document 14: World Championship Poker: World Championship Poker is a series of poker video games first developed by Coresoft and released in 2005 by Crave Entertainment. The series capitalizes on the recent popularity of poker due to the successful World Series of Poker.
Document 15: World Series of Poker: In 2004, Harrah's Entertainment (now Caesars Entertainment) purchased Binion's Horseshoe, retained the rights to the Horseshoe and World Series of Poker brands, sold the hotel and casino to MTR Gaming Group, and announced that the 2005 Series events would be held at the Harrah's - owned Rio Hotel and Casino, located just off the Las Vegas Strip. The final two days of the main event in 2005 were held downtown at what is now the MTR - operated ``Binion's ''in celebration of the centennial of the founding of Las Vegas. The WSOP also added a made - for - television $2 million`` freeroll'' invitational Tournament of Champions (TOC) event first won by Annie Duke as a ``winner - take - all ''event.
ground_truth: 1990
sub_queries: where does the world series of poker take place Answer: Las Vegas
when was the excalibur built in Las Vegas Answer: 1990