Micro-nation based around a nine-story high illegally built tower.

Civil War Fort on an island in the Boston Harbor.

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

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

The world's longest known cave system.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Former hotel turned into haunted playground.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

A bypass decorated with large wooden troll carvings.

This cave holds a surprisingly colorful variety of geological oddities.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

The titular fictional logger only inhabits this otherwise historically focussed museum via a piece of fiberglass kitsch.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.