This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

This French Canadian classic is a specialty of the oldest continually used church in Minneapolis.

The longest covered bridge west of the Mississippi River.

Located on Guam's south shore, this small cave is named for an ancient and powerful Chamorro Chief.

A beautiful waterway tucked in the corner of a power plant.

The underground hideout of a Japanese soldier for whom World War II ended in 1972.

This old residential building was once the largest flour mill in the world.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

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

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

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

The ghost town that ended up on Ebay.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.