Over 60 chemical plants and oil refineries sit in a 15-mile-wide section outside town.

A beautiful geyser under environmental threat.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

The small town of Poulsbo in Washington state is the next best thing to the Kingdom of Norway.

The magic's in the hole!

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Concrete strongholds stand guard over the Golden Gate.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The world’s largest concentrated solar plant generates as many problems as megawatts.

Cryptid lake monster honored with its own monument.

This cave holds a surprisingly colorful variety of geological oddities.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The largest ancient burial mound in Ohio.

Take a drunken tour inside the world's largest known geode.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

This NASA test station is home to some of the world’s largest and most powerful space environment simulation facilities.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

The oldest house in Galena, Illinois, now is a reminder of when this city was the world's lead mining capital.

A large circus museum with summer performances.

This circus town museum recognizes the outstanding clowns of history.

The first declared National Monument in the United States.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

This museum glorifies the humble potato.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."