A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

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

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

The palatial McDonald's that inspired Wesley Willis.

A trading post in the North Pole where children send letters.

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

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

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

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

This popular fishing spot at the outflow of a 4.5-mile long hydroelectric tunnel sports a jetty literally made out of classic cars.

Colorful boxes placed over the dead are left to rot and crumble.

Four-story concrete hotel never opened to customers.

The king of U.S. high points towers over every other peak on the continent.

When ecosystems collide in the arid Southwest.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Iceland's tribute to its thankless civil servants.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This stunning concert hall has become a symbol of Iceland's national recovery.