This beacon for pre-radar pilots once guided Charles Lindbergh to a safe touchdown in Tulsa.

An acoustic anomaly with a mysterious cause.

An enormous natural sandstone bridge in Kentucky.

The world's longest known cave system.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

This old steel industry company town has a tradition of parking cars on the sidewalk so people can walk in the narrow streets.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

Now home to hardy plants, these sand and gravel dunes once held back a massive prehistoric lake.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

This small Arkansas town once had a close encounter with the Beatles, and are determined never to let anyone forget that. Ever.

Local legend says that someone is buried in the trunk.

Town not known for anything except its strange name.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

This historic bridge has weathered fires and floods and still stands, now abandoned, where it has stood since 1874.

The first Russian Orthodox church in North America and an Alaskan landmark.

Alaska Natives have lived on this tiny isolated island in the Bering Strait for over 5,000 years.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

The "Gateway to the Arctic" connects Barrow's indigenous population with the sea and its traditional industry: whaling.

This ghostly Alaska village still clings to a steep cliffside despite having been abandoned for over 50 years.

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

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

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

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.