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

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

I Street Bridge is the heaviest swinging center bridge in the United States.

Art Deco stylings conceal the true nature of this bridge.

The California capital city once stood 10 feet lower than it does today.

A replica of the first public theater built in California.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

An eerie natural formation that looks right back at you.

This small hill features the most notable collection of petroglyphs in Saguaro National Park.

The former home of the army detachment that captured Geronimo.

The state bird of New Mexico, constructed entirely out of garbage.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

Local artists have long claimed these highway pylons as a place to celebrate Mexican-American history through artwork.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

A curious cone-shaped structure made of wire and covered with antlers.

One of the highest points in Bexar county offers birdseye views of San Antonio and a four-story stone tower.

This big empty pig is a nostalgic throwback to mid-20th-century Texas barbecue.

A dam that moonlights as a gigantic, brutalist waterslide.

The world's largest squirrel statue clutches a pecan bigger than your head.

Scattered throughout London are ancient remnants of the city's former bounding wall.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.