One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

Possibly the smallest church in the world floats in the middle of a pond.

The preserved house of a jazz legend still echoes with his music.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

A no-frills cinephile haven known for showing offbeat, underseen films.

The most confusing clock in New York.

A curious friendship between two inanimate ladies.

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Sniff the Titan Arum's rotting flesh.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Ride the subways of yesteryear.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

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

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

A glittering Thai Buddhist temple in suburban Pennsylvania.

This giant disembodied horse head seems to balance impossibly on its nose.

This tiny structure was built by the creator of the Brooklyn Bridge.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

Temporary Burning Man sculpture made of two 18-wheelers.

This unassuming retro burger joint was billed as “diner of the future” at the 1939 World's Fair.