A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Rippling sand dunes frozen in the Arizona rock.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Collection of nearly 500 concrete figures sculpted by the late Veijo Rönkkönen.

A vision of beautiful Hindu architecture in the middle of the American South.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A massive underwater sinkhole made famous by Jacques Cousteau.

148 feet long and in the middle of a verdant forest.

Kentucky's anomalous peninsula projecting into the Mississippi River, site of legendary earthquakes and local feuds.