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

A modern zoetrope on the New York City subway.

The blinking light atop the iconic landmark has been sending secret messages for decades.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

This tower commemorates the spot where George Washington hoisted the Grand Union flag.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

The place where Samuel "Slater the Traitor" brought the Industrial Revolution to America.

The first ever diner included on the National Register of Historic Places is famous for its custard French toast.

One of the world's earliest skyscrapers.

Mysterious rocks that ring musically when struck.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This amazingly preserved Gold Rush town is a historian's dream.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

New Hampshire's most beloved war hero lived out his retirement in this peaceful homestead.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

From horses to stainless-steel trucks, this iconic Providence burger wagon is one of the oldest mobile diners in the country.

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

Millions of numbers carved in glass represent the tattoos forced upon victims.

A classic carnival ride that was carved to be untouchable.