SAN DIEGO (FOX 5/KUSI) -- From the legendary Whaley House, which is widely regarded as America's most haunted house, to Highway 94 being ranked among the top 20 most haunted roadways in the country, there are plenty of ghost stories to entertain those with a penchant for the paranormal. One of these ghosts stories surrounds the oldest standing structure in downtown San Diego. This San Diego road is considered to be among the ‘most haunted’ in US The Davis-Horton House, formerly known as the William Heath Davis House, was built in 1850 and is now the location of the Gaslamp Quarter Historical Foundation and the Gaslamp Museum at the Davis-Horton House. (Gaslamp Quarter Historical Foundation) It has stood at three locations in its lifetime. Its original site was at State and Market streets in 1850, before moving to 227 Eleventh Street between K and L streets and finally to its current location at the corner of Island and Fourth avenues. According to the foundation's website, each room in the museum is meant to represent a part of the house's history, from its usage as a pre-Civil War military officers' barracks to a county hospital and then a private residence occupied by Alonzo Horton, considered the founder of the city of San Diego. Oceanside Sunset Market to host annual ‘Haunted Market’ on Halloween Night In 1873, the house was purchased by Anna Scheper, a German immigrant who contracted with San Diego County to run it as a makeshift hospital, with patients staying in every room except for the parlor and the kitchen. Its colorful past seems to linger in the present — people who have spent time at the house either as visitors or as employees claiming they have felt supernatural energy. There are reports of lights flickering on and off by themselves throughout the house. Museum staff claimed they have turned the lights off at night only to see them turned on the following day. One interesting fact is that the house did not have electricity installed until 1984. (Gaslamp Quarter Historical Foundation) One disembodied guest is allegedly that of a German man named Karl Offer who was arrested as an "alien enemy" on July 12, 1917. Stories claimed the owners of the Davis-Horton House at the time allowed Offer to use their attic to spy on the American Pacific Fleet in San Diego Bay. It was also said that Offer had been involved in "questionable activities in San Diego labor circles," according to The Los Angeles Herald. His ghost is now believed to roam the halls, and in particular, the attic. There have been rumored sightings of an apparition wearing a WWII-era uniform on more than one occasion. Visitors can check out the Davis-Horton House, which is now also the Gaslamp Museum, for themselves during self-guided and guided tours. Admission is $8 for general self-guided tours, $10 for private self-guided tours and $12 for guided audio tours. Hours of operation are Wednesday through Saturday from 10 a.m. to 4 p.m. Private tours are available on Tuesdays and after hours upon request.