Elevated freight railway turned wildly successful urban park.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

The record holder for the world’s largest peach.

An idyllic mineral hot springs facility with a more-than checkered past.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

A wedding chapel, vintage clothing shop, and bar all under one roof.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

The secret city built by the Manhattan Project.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This replica of the Greek structure is in the heart of Nashville.

A beautiful South Korean gate and garden in Little Rock honors American Taekwondo.

Where animatronic singing fish go to retire.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A flat-topped butte that makes a constant backdrop for Western art.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

These aggressively sustainable art homes look like something out of 1970's science fiction.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A historic ruin just 20 feet away from a busy highway onramp.