At the largest railway museum in the United States, you can see everything from an early steam engine to a functioning Thomas the Tank Engine.

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

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

An urban forest overtakes what was the greatest failure of utopic urban housing.

Giant granite rocks standing end-to-end like a train of circus elephants.

Erosion and time have created a naturally-formed water park.

Almost half-way between the Equator and North Pole.

A bizarre house filled with an astounding array of collections.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

This cave holds a surprisingly colorful variety of geological oddities.

Robots, lasers, and whoopee cushions, oh my!

This striking art museum holds an amazing series of curiosity cabinets.

A place to eat for on-the-run agents and espionage enthusiasts.

Statue dedicated to the star of an old television show.

A house and yard adorned with bizarre concrete sculptures in a Milwaukee suburb.

A museum celebrating the self-taught artist-environment builder.