The world's third-largest scale model of the planets.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

First planned industrial community in the United States.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

A trailblazing sovereign nation tucked in the American state of Wisconsin.

The center of the only hemisphere that awards visitors with a commemorative coin.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

An extensive collection of fine art devoted to man's best friend.

A floating museum that was sunk by a flood and left to rot in the tides.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

A museum devoted to osteopathy and its creator, Andrew Still.

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

This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

A small town garden is dedicated to a psychic dog with the most soulful eyes.

This otherworldly church spire reaches up toward the heavens.

An old abandoned pharmacy building in Texas is brimming with collectibles and images of the little tuxedoed pooch.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

A wacky, UFO-shaped house in a suburban neighborhood.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

The highest point in Texas is capped by a big silver pyramid.

Minimalist modern art on a repurposed military base in rural Texas.