Though illegal, city officials have made an exception for this work of art.

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

A memorial to the United States's first wildlife refuge warden.

This small island was the first National Wildlife Refuge ever created in the United States.

The highway's southernmost spot is a beloved local attraction.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

St. Augustine's record-setting narrow street was designed to protect against pirates.

Less a museum than a bizarre fantasy world created by artists and engineers.

This is not your typical jungle gym.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

One of few surviving standpipe water towers in the U.S.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

The headquarters of the prestigious World Food Prize celebrates the heroes in the fight against hunger, has no cafeteria.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

The “American Gothic" artist's largest works hang in an Iowa State University library.

The oldest university museum west of the Mississippi retains its 19th century feel.

A mysteriously dark cemetery monument fuels stories and legends galore.

Millions of dollars worth of sculpture decorate this Iowa city center.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

This zombie-themed restaurant stands out in the heart of corn country.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

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