The former hotel where Tesla invented the radio.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

A celebration of capitalism in Midtown.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

Peek through the gates at this oasis from the city, full of Old English charm.

Bowl in splendor, if you're lucky.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

A Manhattan Episcopal church with an eerie underground crypt.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

The highest point on the island known for buildings that touch the sky.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

This Czar-funded, onion-domed, lavishly muraled Orthodox Church played a starring role in "The Deer Hunter."

Soaring over the Niagara Whirlpool since 1916.

This seemingly cursed monument is dedicated to one of Canada's great war heroes.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

An abandoned stretch of highway, deteriorating next to the operational one.