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

A bizarre house filled with an astounding array of collections.

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

This sprawling building built in 1890 was one of Minnesota’s earliest and largest mental health facilities.

The only arched bridge made of stone on the entire Mississippi River.

When flour explodes, it's not a pretty sight.

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

20,000 pieces in a Frank Gehry-designed building.

An architecturally-focused antique shop.

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

The famed architect designed this Minnesota gas station of the future with a lookout tower.

An abandoned, rusty old relic of railroad history stands at attention over the Cuyahoga River.

This massive airship factory is so large that it has its own indoor weather.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Rare recess caves fill this unbelievably beautiful Ohio park.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

The ruins of a paper mill destroyed during the Civil War still tower over a tributary of the Chattahoochee River.

This wondrous hideaway is suspended in a bamboo forest above a sanctuary for rescued llamas and alpacas.

An early-19th-century hotel with a past that is steeped in the Civil War.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

A beautifully detailed Victorian house designed to be easy to flee, built by a man haunted by fire.

An unusual art exhibition in a suburban yard is designed to awaken the souls of those flowing by.

A white oak with property rights.

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.