This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

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

The site of a tragic massacre that spawned a multimedia franchise.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A castle built for love, and abandoned due to heartbreak.

You thought Santa Claus didn't exist, but it turns out you were wrong.

Here lies Lilly E. Gray, an alleged "victim of the beast," but the reason long remained a mystery.

The highest point in Indiana is curated by an Eagle scout but may be in danger of losing its record to a nearby garbage pile.

The longest navigable underground river in the United States is home to countless blind and albino animals.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

The first spinning jail built in the United States is the only one that still turns.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

Go inside the house that inspired L. M. Montgomery to create one of literature's most beloved heroines.

New Plymouth, Idaho is the only U-shaped town in the United States.

An inconspicuous footbridge beloved by San Diego locals.

A monument to a survivor of harsh pioneer life, frostbite, and primitive surgery.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

A local dialect born in the late 19th century is only spoken in this isolated California valley.

A mistaken marker makes an erroneous claim along the historic Old Divide Road.