Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

Semi-recognized center of the world, with many oddities.

Inside this clubhouse is a cinephile's paradise.

This stockpile of junked electronic and mechanical gadgets is a favorite among Hollywood prop masters.

This former stomping grounds of the most eminent astronomers of the early 20th century.

The only road through the heart of Glacier National Park.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A former utopian healing center created by a huckster and built by derelicts.

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

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Walk the whole Mississippi River!