A train tunnel that was made obsolete by the dam it helped create.

A famous big wave from Japan serves as a tribute to the victims of the disastrous Elbe flood.

Towering basalt columns, a creation of fire and ice.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

This East German military command bunker was ready for World War III.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

One of the most iconic neon ads of former East Germany.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

A midcentury ranch house hides a literal treasure trove of unique rocks and minerals.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

Tiny memorials honor individual victims of the Holocaust.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

Everything you always wanted to know about borates is here.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.

The seamy, underground secrets of Portland's criminal past.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Fossilized sea bottom and lime quarry.

This small exhibition displays equipment and artifacts once belonging to the feared Stasi secret police.

A museum dedicated to a Cold War era sausage.

Four hundred granite steps were built into this massive rock by the National Park Service.

A fascinating insight into daily life in the Eastern Bloc.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.