The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

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

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

This downtown Dallas art installation is always on the lookout.

A symbol of Texas pride.

This sculpture of a bowler hat is complemented by a matching umbrella a few blocks away.

Its dark depths conceal millions of rare, delicate crystal formations.

A popular tourist cave with a dark past.

A tourist attraction founded around a slumping cabin.

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

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

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

These markers are used to determine the ground stability of the Strip.

A fire lookout atop a glacial pinnacle is reached by climbing three vertiginous flights of stairs.

This 19th century train workshop is a treasure trove of railroad history.

Puzzling...this tree looks like an assemblage of dismembered monkey limbs.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

The longest burning light bulb in the world.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Thousands of crosses and markers for soldiers who lost their lives in Iraq and Afghanistan blanket a California hillside.

A modern mechanical planetary system, part of a 10,000 year clock.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

The perfect spot for a picnic, right next to a giant ballistic missile.

Wheels of chrome by the thousands adorn this California Historical Landmark.