This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

Former self-sufficient mental institution now a planned community.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

Strange physical sensations and optical contradictions keep visitors coming back for more.

This nearly 200-foot tall limestone stack offers visitors amazing views and a chance to meet Paul Bunyan and Babe the Blue Ox.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

Beautiful scenery, history, science, and physics come together in this remnant of shipping lore.

Watch the ships come in on Michigan's 210 ft. high observation deck in Sault Ste. Marie.

These dramatic cola-colored falls have appeared in a poem by Henry Wadsworth Longfellow and a song by Sufjan Stevens.

This 19th-century ghost town offers a stunning view of Lake Michigan and a journey through the region's industrial past.

This freshwater spring fills with 10,000 gallons of water per minute.

Two dozen rescued bears roam (mostly) free at the largest bear ranch in the U.S.

This was the first ever National Lakeshore, established in 1966.

This municipal park along the Missouri River honors the galley central to the Lewis & Clark Expedition with a replica ship and sculptures.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

Oddly shaped rock formation, misassociated with a nearby utopian community.

The unusual patterns in this rock formation result from two distinct modes of weathering.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.