You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what was the first hotel built in las vegas?" whose answer is El Rancho Vegas.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was the first hotel built in las vegas
Useful Output:

Doc 1: Completed in 1999, The Venetian Resort Las Vegas was envisioned as a tribute to the famed city of Venice, Italy, the location of the honeymoon of Mr. Sheldon
Doc 2: Did you know Las Vegas' oldest hotel-casino still stands today? It's the Golden Gate located at 1 Fremont Street. Built in 1906, the hotel
Doc 3: The Golden Gate hotel and casino downtown is the oldest building built in 1906, operating hotel on Fremont Street which is historic old Las Vegas.
Doc 4: Known as “Hotel Nevada” when it first opened in 1906, the Golden  First hotel in Las Vegas; First Las Vegas telephone; First electric
Doc 5: Did you know the Golden Gate Hotel and Casino is the oldest casino in downtown Las Vegas and was called Hotel Nevada?