Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

Shoreline strewn with the remains of ghostly fallen trees.

Stroll through a wonderland of stupendous moss-covered trees.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

This expansive bridge in the Canadian wilderness was originally just built for friends.

This quirky piece of naval artillery has been deafening Canadians for over a century.

A sarcastic monument threatens to curse any "idiot" who dares remove it.

A giant poultry statue immortalizes one of Alaska's more humorous town names.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Roadside collection of 65,000 signs.

A historic freight system that found the true gold rush is in tourism.

The ghostly remains of what was once the world's richest copper mine.

European castle ruins in an American state park are actually the product of death and grief.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Three hundred years of preserved Spanish colonial history in San Antonio.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

This is one really big nut.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

A skeletal collection of former nautical mainstays.

A man-made island in scenic San Francisco Bay.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

A 300-ship graveyard, with a few still visible at low tide.