A surviving concrete arrow from a 1920s navigational network is preserved right off a modern freeway.

Albuquerque found the perfect use for tumbleweeds at Christmastime.

With a floor made of thick glass, this observation deck offers a full view of Sunwapta Valley's mountains and rivers.

Stand at the point where the two mightiest rivers in the United States converge.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A magical place that lets you play in and explore the world of Studio Ghibli.

This elaborately-carved white marble fountain was built to stand outside the Detroit Opera House.

Denmark’s never-ending bridge.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The largest mural in the world painted by a single artist.

A home covered with elaborate mosaic and other pieces of art.

One of the oldest living oak trees in the Southeast.

One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This small piece of Michigan is entirely surrounded by Ohio.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

A fiery crater has been burning in the Karakum Desert since 1971.

This desert oddity hides in plain sight thanks to a cartographic error and a desert explorer with a punny sense of humor.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.