one more useful map:
Homicides in the District of Columbia

Do they have the same map for NYC, I wonder?
A sort of an app on one's smart cell phone.

When you go out of the metro station - say in South Bronx and in the evening - the phone informs politely about a chance to be whacked this hour of the day.
Phone can choose for you to follow certain "green corridor" to minimize chances of being whacked (with constant gang "traffic update").

When I lived at Upton street metro in DC, my landlord, Mr Batson, mentioned to me once that he never ventured by foot outside his place after 6-7 pm or after dark. He lived more than 40 years in the North-West corridor of Wash DC (Upton street, 400 yards near metro station).
In general, it was and still is considered as a safe place - there is a bunch of embassies nearby and the educational place called American University, where a considerable fraction of professors were not American, at least, in my time.
After dark, Mr Batson never ventured outside his place even to buy a newspaper in a kiosk near metro station. If he needed to go to some place, say, 500 meters away, he used his car.

Once upon a time, I once walked about one hour and a half from Farragut North metro (close to White house) to my place at Upton street going north along Connecticut Avenue.
During ~30 minutes of my "walking time", a police car was crawling behind me, they thought about me probably as of "walking bait".

That night, Mr Batson waited for me in the living room.
It was Good Friday night before Easter. I told him that I would stop by a church service.
He met me at the door almost crying. Then after the first surge of emotions, he accused me of being totally insane and irresponsible dude - if I walked such a distance by my own will.
I promised him that I would never repeat such a walk again.

During WWII, he served for 4 years as a sailor. He chased German subs in Atlantic ocean.
He sailed as a crew member of corvette, which is a relatively small vessel.

He told me about a huge storm in Caribbean. The thing he remembered most was that everybody including the captain was vomiting like crazy shit. It was famous Atlantic hurricane of 1944. One US Navy ship (named Warrington) in fact did not make it through this storm and 250 sailors sank.

He said, the captain started to puke over the board only on the 3-d day.
Mr Batson was done on the second day as the rest of the crew.
He said that he still remembers those huge waves and constant puking, but he added that it was the only "unpleasant" episode he vividly remembers.

Supposedly, they detected only 4 subs in all the years. Mostly they just burnt diesel and checked the cargo of of neutrals flags from time to time. Their corvette when chasing the sub with several other corvettes managed to sank the one.

Once, in one Miami bar, he had met Ernest Hemingway, more accurately - sort of met..
The moment he and his friends entered the bar - papa Ham and some other army dudes started a fight with a few sailors (papa Ham considered himself as an Army guy, and Army guys did not like Navy sailors - such a strange twist of machismo or pecking order during that time).

Mr Batson, though, did not remember about who won, yet he said it was much more Army guys in that bar than sailors.
He added that the Navy-Army battle continued on a street and eventually became a huge brawl. He said he was heavily drinking rum earlier that evening, and this helped him to give a pair of good jabbers to some dudes, it could be papa Ham himself.

Interesting fact about Mr Batson is that after WWII he married a professional dancer, sort of follower of Isidora Duncan. His wife taught dance to kids of Gary Truman. She was invited to White house for a couple of kid-related events.
His daughter taught dance in University of North Carolina awhile ago.
His son was a poet writing lyrics for local folk and rock groups.

Aged fellow, Mr Batson, was an extremely smart dude and a good story-teller.
He explained me amazing things about how big money works in this country and the ways "fat cats" managed to hide their earnings and not to pay taxes.
He could go talking about some of his friends financial success stories by hours.
I only understood that their travesty ended happily only due to right connections and huge chunk of luck.
Taxation had a lot of loopholes during old days.
Then he told me about the gold expropriation in 1934 (Great Depression time) and how people managed to cheat the system and became filthy rich by digging out the gold after 40 years of hiding.
He has a few billionaires among his pals.

Mr. Batson was the same very person who starter as a farm boy and ended as as one of financial advisers to Carnegie foundation.

*****************************************************************
Back to walking streets at night in NYC.
Here, I recalled a very old story of Edik Limonov entitled "East side - West side"

It is a short story (only 4 pages) how he ventured once into South Bronx in NYC during one warm summer night.
His "hero" wore a white suit and carried 12 red roses.
He was moderately drunk and chose a totally wrong direction when walked from subway station at midnight.
He described a few encounters and his tricks that helped him to stay alive.

"Do you think that your life is boring, my fellow reader? I will open your eyes on how close you can be to war, death, and destruction. And you can do nothing about it"..