Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

A giant Troll lurks under one of Seattle's oldest bridges.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

The largest outdoor art gallery in the Northwest United States.

Home to the deepest rift anywhere on Earth.

A fitting attraction for the corn capital of the world.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

Spectacular views await visitors to this lake.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

The Iowa state contender for largest pan in the world oddly only comes in second or so.

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

Nestled in Onondaga State Park, over 100 canoes carefully stacked in a replica of the famous standing stones.

The iconic remains of the original Academic Hall that burned down in 1892.

Two Ming Dynasty lion statues guard the entrance to the journalism school.

This recently restored timepiece has stood all around Kansas City.

The obelisk meant to mark the founding father's grave at Monticello is actually on the University of Missouri campus.

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

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

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

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

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.