I spent a day on NYC's Billionaires' Row. Here's your ultimate guide to one of the city's glitziest streets, which borders Central Park and is home to the most expensive apartment ever sold in the US.

Katie Warren/Samantha Lee/Business Insider

Five of the eight Billionaires' Row skyscrapers as seen from Central Park.

• Billionaires' Row in New York City is known for having some of the most expensive residential real estate in the world.
• I walked around the area to get a look at eight of the newest supertall luxury skyscrapers, several of which are still under construction.
• Billionaires' Row includes Central Park Tower, the tallest residential building in the world.
• Visit Business Insider's homepage for more stories.

In wealthy cities around the world, from New York to London to Los Angeles, a certain ritzy neighborhood or street is given an extravagant nickname: Billionaires' Row.

The term generally refers to a super-wealthy part of a city that's home to some of the world's richest people living in some of the world's most expensive homes.

In New York City, Billionaires' Row includes a set of eight ultra-luxury skyscrapers along the southern end of Central Park in Manhattan. The buildings were recently built or, in some cases, are still under construction.

Read more: What it's like to vacation in the exclusive community on the French Riviera nicknamed the 'Peninsula of Billionaires,' where royalty and tech tycoons live in opulent villas

"I like to define Billionaires' Row as New York City's Monopoly board for uber-wealthy international and domestic titans of industry who come together here to work, play, and do lots and lots of shopping," Alexander Glibbery of Compass told me.

Indeed, Billionaires' Row is just a few blocks from the city's most glamorous shopping district: Fifth Avenue.

StreetEasy describes Billionaires' Row as "an enclave around 57th Street" that's "become a symbol of the city's increasingly stupendous riches."

The new towers at Billionaires' Row - some of which have not yet welcomed residents - have already seen record-breaking real-estate sales.

In January, billionaire hedge-fund manager Ken Griffin broke the record for the most expensive home ever sold in the US when he bought a $238 million penthouse at 220 Central Park South, a Billionaires' Row skyscraper designed by Robert A.M. Stern that's still under construction.

I walked around Billionaires' Row on a recent spring afternoon. Here's what it looks like.