Toxic waste disaster that founded the Superfund program.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

A large stone map of Arkansas awaits visitors to its highest point.

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

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

The World's Largest Bull.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

This massive marble memorial was built bit by bit either out of devotion or spite, but at the expense of the surrounding town.

The first home of the doomed aviatrix Amelia Earhart.

Lone survivor from Custer's Last Stand forever preserved.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

This sacred space and gathering spot for the Wyandot Nation has been the surrounded by controversy and confusion.

This abandoned prison castle has become an imposing gallery of graffiti art.

This giant green head remembers one of America's jazz giants.

Community bookshelf of 25-foot-tall book spines.

The king of U.S. high points towers over every other peak on the continent.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

Watch the newest land on the planet form before your eyes.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A controversial memorial at the place where Captain Cook met his violent end.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.