The remains of a World War II munitions factory still haunt the fields of this Twin Cities suburb.

Vikings and Evangelicals have both had a hand in this replica medieval church.

Hidden in magnificent rolling countryside, see what may be the largest modern stone circle in the world at Wisconsin's very own "Stonehenge”

Sleepy Minneapolis block beats Guinness Record for most churches on one city block.

1887 era Russian Orthodox church in Minneapolis.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

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

This cave holds a surprisingly colorful variety of geological oddities.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

Five acres of divinely inspired folk art.

This large midwestern cavern features impressive rock formations and an underground waterfall.