The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

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

This impressive working clock made of 16,000 plants changes its flowers twice a year.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

This little museum in the town where zombies were born celebrates the living dead.

For decades, it has disappeared and reappeared as water levels rise and fall.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The first and only American institution dedicated to the enduring value of comedy in the United States.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

A retrofuturistic art installation in the Pittsburgh Airport.

This steamer is known as "The ship that built Cleveland."

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

The most accurate timepiece in the world.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.