Once a year, ambitious surfers can ride the world's largest river.

A unique collection of more than 250 rocks and minerals located on a university campus.

This giant Massachusetts sycamore is said to hold the dubious distinction of being the "widest tree East of the Mississippi!"

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Step into a pastel time capsule where candy is truly dandy.

These Benedictine nuns have been making artisanal cheeses since before it was cool.

The intriguing personal collection of a professional demon-chaser.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

A mysterious collection of stones stand outside a small New England town.

At this site, two historic stone bridges spanning the Sing Sing Kill—one right on top of the other.

Referred to as "the crappiest fountain ever," this sculpture has been splashing unknowing passersby since 1969.

A once-abandoned school building converted into a fantastical multi-level art installation and haven for Appalachian artists.

A hidden alley with seven corners and handmade cat decorations.

A quirky collection of outsider art made from automobile parts.

This roadside sculpture garden in New Mexico venerates Mother Earth and outsider art.

Every summer, this shrine sets up a tiny drinking fountain reserved for thirsty apians.

One of the smallest churches in the United States is located along the side of the road in a residential neighborhood.

An artist sees trees as a medium for sculpture.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

A layered tribute to the work of mosaicist Isaiah Zagar.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

The abandoned coal loading dock is a canvas for unsanctioned art.