The remains of what was once the world's steepest passenger funicular.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

New York's southernmost subway station is whimsically wavy.

The competition: breathe deeply as long as you can.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

The home of the first American-born saint is one of the only curved buildings in New York.

A young woman's senseless murder led to the controversial psychological theory of the "bystander effect."

The home of aviation trailblazers, in a remote corner of the big city.

You must take the A train... to the last active cemetery in Manhattan.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

The first and only carousel with a lineup entirely of insects.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

Elevated freight railway turned wildly successful urban park.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Home to items never before seen by the public.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.