Question: What city was formerly home to "Maggie", who's best remembered for exhorting the crew in Lifeboat No. 6 to return to the debris field of the 1912 sinking of RMS "Titanic" to look for survivors?
Context: The wreck of the RMS "Titanic" lies at a depth of about 12500 ft (2.37 miles ), about 370 mi south-southeast off the coast of Newfoundland.  It lies in two main pieces about a third of a mile (600 m) apart.  The bow is still largely recognizable with many preserved interiors, despite its deterioration and the damage it sustained hitting the sea floor.  In contrast, the stern is completely ruined.  A debris field around the wreck contains hundreds of thousands of items spilled from the ship as she sank.  The bodies of the passengers and crew would have also been distributed across the sea bed, but have been consumed by other organisms. Titanica is a 1992 IMAX documentary film about the RMS "Titanic".  The film was directed by Stephen Low and narrated by Cedric Smith, Anatoly Sagalevich and Ralph White.  The film mostly focuses on footage taken at the wreck of the RMS "Titanic", also featuring footage of the expedition crew searching the wreck as well as interviews with "Titanic" survivors Frank John William Goldsmith and Eva Hart.  Using Eva and the crew members, Low conveys the voice of the documentary by showing the Titanic's wreckage as a graveyard which is to be respected and treated with caution and care.  It was the second feature length IMAX film released, following "Stones at the Max" in 1991.  An edited 40 minute version of the film was also later released for IMAX theatres in 1995; this version had new narration by Leonard Nimoy, though it retains most of White's narration.  This edited version later became the basis for another edited version released in 1997, featuring 27 more minutes of interviews with Ralph White, Emory Kristof, and other experts. The magnetic detector or Marconi magnetic detector, sometimes called the "Maggie", was an early radio wave detector used in some of the first radio receivers to receive Morse code messages during the wireless telegraphy era around the turn of the 20th century.  Developed in 1902 by radio pioneer Guglielmo Marconi from a method invented in 1895 by New Zealand physicist Ernest Rutherford it was used in Marconi wireless stations until around 1912, when it was superseded by vacuum tubes.  It was widely used on ships because of its reliability and insensitivity to vibration.  A magnetic detector was part of the wireless apparatus in the radio room of the RMS "Titanic" which was used to summon help during its famous 15 April 1912 sinking. Edith Louise (Rosenbaum) Russell (June 12, 1879 – April 4, 1975) was an American fashion buyer, stylist and correspondent for "Women's Wear Daily", best remembered for surviving the 1912 sinking of the RMS "Titanic" with a music box in the shape of a pig.  The paper mache toy, covered in pigskin and playing a tune known as "The Maxixe" when its tail was twisted, was used by Edith Russell to calm frightened children in the lifeboat in which she escaped.  Her story became widely known in the press at the time and was later included in the best-selling account of the disaster "A Night to Remember" by Walter Lord.  Russell was also portrayed in the award-winning British docudrama produced by William MacQuitty that was based on Lord's book. The Molly Brown House Museum (also known as House of Lions) is a house located at 1340 Pennsylvania Street in Denver, Colorado, United States that was the home of American philanthropist, socialite, and activist Margaret Brown.  Brown was known as "The Unsinkable Molly Brown" because she survived the sinking of the RMS "Titanic".  The museum now located in her former home presents exhibits interpreting her life and that of Victorian Denver as well as architectural preservation.  The house was listed on the National Register of Historic Places in 1972. Colonel Archibald Gracie IV (January 15, 1858 – December 4, 1912) was an American writer, amateur historian, real estate investor, and survivor of the sinking of the RMS "Titanic".  He was the first adult survivor to die after rescue .  He survived the sinking by climbing aboard an overturned collapsible lifeboat and wrote a popular book about the disaster, which is still in print today. Frederick Barrett (1884 – unknown) is best known as a survivor of 1912 sinking of the RMS "Titanic" in Lifeboat No. 13 . Margaret "Maggie" Brown (née Tobin) (July 18, 1867 – October 26, 1932) (posthumously known as "The Unsinkable Molly Brown") was an American socialite and philanthropist.  She is best remembered for exhorting the crew in Lifeboat No. 6 to return to the debris field of the 1912 sinking of RMS "Titanic" to look for survivors.  Accounts differ on whether the boat actually returned to look for survivors, and if so, if any survivors were found.  During her lifetime, her friends called her "Maggie", but even by her death, obituaries referred to her as the "Unsinkable Mrs. Brown".  The reference was further reinforced by a 1960 Broadway musical based on her life and its 1964 film adaptation which were both entitled "The Unsinkable Molly Brown". Don Lynch is a historian with the Titanic Historical Society.  He co-authored the book "Titanic: An Illustrated History" in 1992 with Ken Marschall and later co-authored "Ghosts of the Abyss".  Lynch has an extensive collection of Titanic memorabilia and even more extensive knowledge of the subject, having researched the RMS "Titanic" along with Marschall since the early 1970s.  His research includes interviews with survivors of the maritime disaster and dives to the "Titanic" shipwreck at the bottom of the Atlantic Ocean.  He has collaborated with several other authors and documentary filmmakers as a consultant and archival material supplier.  Lynch has appeared on several television documentaries about the sinking of the "Titanic". Rigel was a large black Newfoundland dog who was said to have saved some of the survivors of the sinking of the RMS "Titanic".  One account of the story was published in the "New York Herald", April 21, 1912, the other was the book "Sinking of the Titanic and Great sea disasters" by Logan Marshall, published 1912.  However, although the story has been widely reproduced, there is doubt about whether the dog actually existed.
Answer: 1340 Pennsylvania Street in Denver, Colorado, United States