One thing you should be aware of in DC is crime. Just stay with the crowds and don't venture into unknown neighborhoods. If you have to travel across town take a cab, don't try and walk. Only use public transportation during busy periods. Although Dc is no longer characterized as a murder capital, there is still crime that preys on tourists. Here is an excerpt from the crime report on DC.
During the violent crime wave of the early 1990s, Washington, D.C. was known as the murder capital of the United States and often rivaled New Orleans in the number of homicides.[93] The number of murders peaked in 1991 at 479, but the level of violence declined drastically in the 1990s. By 2009, the annual murder count in the city had declined to 143, the lowest number since 1966.[94] In total, reports of violent crimes and property crimes have both declined by half since 1993.[95]
Like most large cities, crime is highest in areas associated with illegal drugs and gangs. A 2010 study found that 5% of city blocks contributed to over one-quarter of the District's total crime.[96] The more affluent neighborhoods of Northwest Washington are typically safe, but reports of violent crime increase in poorer neighborhoods generally concentrated in the eastern portion of the city.[96] Approximately 60,000 residents of Washington, D.C. are ex-convicts.[97]
Many neighborhoods such as Columbia Heights and Logan Circle are becoming safer and vibrant. However, incidents of robberies and thefts have remained higher in these areas due increased nightlife activity and greater numbers of affluent residents.[98] While instances of property crime remain high, reports are still half the level cited during the mid-1990s, and the patterns of theft continue to disperse to the north and east of downtown.[99]
On June 26, 2008, the Supreme Court of the United States held in District of Columbia v. Heller that the city's 1976 handgun ban violated the Second Amendment right to gun ownership.[100] However, the ruling does not prohibit all forms of gun control; laws requiring firearm registration remain in place, as does the city's assault weapon ban.[101]