An inconspicuous footbridge beloved by San Diego locals.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A bit of retro transportation flair preserved in the world's largest department store.

There must be a pun in this haystack somewhere...

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Those belting out show tunes might not realize this piano bar marks the site where Thomas Paine died in 1809.

The site of the deadly Triangle Shirtwaist Factory Fire.

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Once a flowing stream and where the USS Monitor, the world's first ironclad, was built and launched.

Red frames showcase remnants of one of New York's original subway stations.

An artist's cute bronze subway sculptures belie his violent artistic past.

The most confusing clock in New York.

The only subway station in the city that still makes use of gap fillers.

A decommissioned military complex that's now a modern industrial park.

Elevated freight railway turned wildly successful urban park.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

An aptly-named street near the birthplace of the modern LGBT rights movement.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

The first piece of public art dedicated to LGBT rights.

Salute the leader of the proletariat.

New York City's only radical feminist independent bookstore.